Smith & Wesson Forum

Go Back   Smith & Wesson Forum > Ammunition-Gunsmithing > Reloading
GenBiz

Reloading All Reloading Topics Go Here


Reply
 
Thread Tools Display Modes
  #1  
Old 07-02-2022, 11:18 AM
sbrmike sbrmike is offline
US Veteran
357 Mag small pistol or small pistol mag primers 357 Mag small pistol or small pistol mag primers 357 Mag small pistol or small pistol mag primers 357 Mag small pistol or small pistol mag primers 357 Mag small pistol or small pistol mag primers  
Join Date: Jul 2014
Location: Potter County, PA
Posts: 285
Likes: 19
Liked 293 Times in 88 Posts
Default 357 Mag small pistol or small pistol mag primers

I have never used Small Pistol Magnum Primers in my 357 Magnum 158 grain .358" diameter L-SWC loads over 6.0 grains of Unique. Does anyone recommend the magnum primers for this load?
Reply With Quote
  #2  
Old 07-02-2022, 11:40 AM
Paul in Nevada Paul in Nevada is offline
Member
357 Mag small pistol or small pistol mag primers 357 Mag small pistol or small pistol mag primers 357 Mag small pistol or small pistol mag primers 357 Mag small pistol or small pistol mag primers 357 Mag small pistol or small pistol mag primers  
Join Date: Mar 2021
Posts: 405
Likes: 823
Liked 416 Times in 205 Posts
Default

I would save the magnums for other loads. I doubt you would be over pressure with the magnums since the listed velocity is only 1kfps but obviously you should reduce and work back up when switching components. If that's all you have go for it. Otherwise it's a waste.
__________________
Turn off the media, go outside
Reply With Quote
The Following 2 Users Like Post:
  #3  
Old 07-02-2022, 11:45 AM
WR Moore WR Moore is offline
Member
 
Join Date: Oct 2006
Posts: 5,322
Likes: 787
Liked 3,776 Times in 1,915 Posts
Default

The magnum primers are for hard(er) to ignite powders than Unique. The cups may also have slightly different specs to better withstand high pressures. In 50 odd years of reloading .38/.357 I've only used the magnum primers once, and that was recently, because the load data was developed using them AND, I'd bought 500 of them by mistake.
Reply With Quote
The Following 4 Users Like Post:
  #4  
Old 07-02-2022, 12:30 PM
CH4's Avatar
CH4 CH4 is offline
Member
357 Mag small pistol or small pistol mag primers 357 Mag small pistol or small pistol mag primers 357 Mag small pistol or small pistol mag primers 357 Mag small pistol or small pistol mag primers 357 Mag small pistol or small pistol mag primers  
Join Date: Jul 2014
Location: Sin City
Posts: 7,469
Likes: 14,240
Liked 16,336 Times in 4,850 Posts
Default

Unique works just fine with both magnum and non-magnum primers.
__________________
FBINA 213th Session
Reply With Quote
  #5  
Old 07-02-2022, 01:08 PM
sbrmike sbrmike is offline
US Veteran
357 Mag small pistol or small pistol mag primers 357 Mag small pistol or small pistol mag primers 357 Mag small pistol or small pistol mag primers 357 Mag small pistol or small pistol mag primers 357 Mag small pistol or small pistol mag primers  
Join Date: Jul 2014
Location: Potter County, PA
Posts: 285
Likes: 19
Liked 293 Times in 88 Posts
Default

Thanks for the replies. I'll stick with Small Pistol Primers.
Reply With Quote
  #6  
Old 07-02-2022, 01:20 PM
alwslate alwslate is offline
Member
357 Mag small pistol or small pistol mag primers 357 Mag small pistol or small pistol mag primers 357 Mag small pistol or small pistol mag primers 357 Mag small pistol or small pistol mag primers 357 Mag small pistol or small pistol mag primers  
Join Date: Dec 2009
Location: Indiana
Posts: 5,646
Likes: 2,447
Liked 5,550 Times in 2,388 Posts
Default

Most handloading manuals specify magnum primers with all.357 loads due to the tall case and air space with light loads. My chronographing tests show improved consistency with magnum primers with all .357 loads, light to heavy so that’s all I use.
Reply With Quote
The Following 3 Users Like Post:
  #7  
Old 07-02-2022, 01:35 PM
Greyman50's Avatar
Greyman50 Greyman50 is offline
US Veteran
357 Mag small pistol or small pistol mag primers 357 Mag small pistol or small pistol mag primers 357 Mag small pistol or small pistol mag primers 357 Mag small pistol or small pistol mag primers 357 Mag small pistol or small pistol mag primers  
Join Date: Apr 2021
Location: Florida
Posts: 2,429
Likes: 7,620
Liked 3,925 Times in 1,488 Posts
Default

I use SPMP with 2400, SPP with Unique, never problems since 75.
Reply With Quote
The Following User Likes This Post:
  #8  
Old 07-02-2022, 05:45 PM
venomballistics's Avatar
venomballistics venomballistics is online now
Member
357 Mag small pistol or small pistol mag primers 357 Mag small pistol or small pistol mag primers 357 Mag small pistol or small pistol mag primers 357 Mag small pistol or small pistol mag primers 357 Mag small pistol or small pistol mag primers  
Join Date: Aug 2007
Location: between beers
Posts: 7,688
Likes: 4,018
Liked 5,257 Times in 2,614 Posts
Default

You could use magnums in it, but there's no logical reason to support it outside availability.
__________________
it just needs more voltage
Reply With Quote
The Following User Likes This Post:
  #9  
Old 07-02-2022, 06:52 PM
243winxb 243winxb is offline
Member
357 Mag small pistol or small pistol mag primers 357 Mag small pistol or small pistol mag primers 357 Mag small pistol or small pistol mag primers 357 Mag small pistol or small pistol mag primers 357 Mag small pistol or small pistol mag primers  
Join Date: Nov 2001
Location: USA
Posts: 111
Likes: 67
Liked 66 Times in 36 Posts
Default

If you get a pierced primer, ever, switch to magnum.

If using 2400 powder, a WSPM primer will require a reduction in 2400 powder.SAAMI PRIMERS | The High Road
Attached Images
File Type: jpg SAAMI PRIMERS.jpg (20.8 KB, 55 views)

Last edited by 243winxb; 07-02-2022 at 07:12 PM.
Reply With Quote
  #10  
Old 07-02-2022, 07:32 PM
oddshooter oddshooter is online now
Member
357 Mag small pistol or small pistol mag primers 357 Mag small pistol or small pistol mag primers 357 Mag small pistol or small pistol mag primers 357 Mag small pistol or small pistol mag primers 357 Mag small pistol or small pistol mag primers  
Join Date: Aug 2014
Location: the free state of Arizona
Posts: 869
Likes: 1,960
Liked 1,551 Times in 529 Posts
Default

I have often read that the Magnum primers were for slower powders like H110 or 4227.

I have noticed myself that a magnum primer can clean up a dirty load (unburnt grains of powder) some as well.

Prescut
Reply With Quote
  #11  
Old 07-02-2022, 08:21 PM
Krogen Krogen is offline
Member
357 Mag small pistol or small pistol mag primers 357 Mag small pistol or small pistol mag primers 357 Mag small pistol or small pistol mag primers 357 Mag small pistol or small pistol mag primers 357 Mag small pistol or small pistol mag primers  
Join Date: Sep 2011
Location: Puget Sound
Posts: 2,062
Likes: 6,427
Liked 3,498 Times in 1,210 Posts
Default

Alliant doesn't recommend magnum primers with Unique in the .357 Magnum. I'd rely on their expertise.
Reply With Quote
The Following 4 Users Like Post:
  #12  
Old 07-02-2022, 09:15 PM
DWalt's Avatar
DWalt DWalt is offline
Member
357 Mag small pistol or small pistol mag primers 357 Mag small pistol or small pistol mag primers 357 Mag small pistol or small pistol mag primers 357 Mag small pistol or small pistol mag primers 357 Mag small pistol or small pistol mag primers  
Join Date: Dec 2009
Location: South Texas
Posts: 29,785
Likes: 50
Liked 23,451 Times in 11,797 Posts
Default

Small Rifle primers will work just as well. Pretty much identical to a SPM primer. I have used SR primers only in all of my .38 Special and .357 loads for many years, and even in several other calibers.
Reply With Quote
The Following User Likes This Post:
  #13  
Old 07-02-2022, 09:32 PM
Eddietruett Eddietruett is offline
Member
357 Mag small pistol or small pistol mag primers 357 Mag small pistol or small pistol mag primers 357 Mag small pistol or small pistol mag primers 357 Mag small pistol or small pistol mag primers 357 Mag small pistol or small pistol mag primers  
Join Date: Dec 2016
Location: South Carolina
Posts: 1,573
Likes: 950
Liked 3,210 Times in 884 Posts
Default

I have used Federal magnum SPP exclusively in every 9mm, 38, 357 that I’ve loaded for the last 5-6 years with Titegroup, Bullseye, Unique, Universal, CFE Pistol, 2400, H110 and Lil Gun. I have seen no noticeable difference except it does help some powders burn cleaner. I’ve checked loads as light as 2.7gr Bullseye to Max loads with 2400 with a chronograph and saw more difference from gun to gun than I did from Std to Magnum primers. No high pressure signs. Your results may vary but I’ll continue to use magnum since that’s all I have
Reply With Quote
The Following 3 Users Like Post:
  #14  
Old 07-02-2022, 10:09 PM
ArchAngelCD's Avatar
ArchAngelCD ArchAngelCD is offline
Moderator
357 Mag small pistol or small pistol mag primers 357 Mag small pistol or small pistol mag primers 357 Mag small pistol or small pistol mag primers 357 Mag small pistol or small pistol mag primers 357 Mag small pistol or small pistol mag primers  
Join Date: Dec 2006
Location: Northeast PA, USA
Posts: 7,577
Likes: 735
Liked 3,730 Times in 2,038 Posts
Default

Magnum primers are only needed for powders which are hard to ignite like W296/H110, HS-7, HS-6 and the like. They work better when lit by a magnum primer.

Unfortunately load manuals these days use SPP for .38 Special and other "standard" cartridges while they use SPM primers for anything that has a "magnum" name. I wrote Hodgdon and asked them why and they said they use and list a magnum primer for cartridges like the .357 Magnum because even if the powder doesn't need one because they are concerned some reloaders will not read the primer used and assume a magnum primer is required. That may raise the pressures making the max powder charge no longer within the max pressure limits.

If you have older manuals like the Speer 8 or 9 look at the data for the .38 Special using HS-6/W540 and you will see a magnum primer was used in the load development.

Unique and 2400 are very old powders developed before magnum primer were made. They seem to perform better with a standard primer over a magnum primer. The SD and ES numbers are lower with standard primers so that's what I would use, even with 2400 in the .357 Magnum.

I hope this helps a bit...
__________________
Freedom is never free!!
SWCA #3437
Reply With Quote
  #15  
Old 07-03-2022, 12:32 AM
alwslate alwslate is offline
Member
357 Mag small pistol or small pistol mag primers 357 Mag small pistol or small pistol mag primers 357 Mag small pistol or small pistol mag primers 357 Mag small pistol or small pistol mag primers 357 Mag small pistol or small pistol mag primers  
Join Date: Dec 2009
Location: Indiana
Posts: 5,646
Likes: 2,447
Liked 5,550 Times in 2,388 Posts
Default

Quote:
Originally Posted by Krogen View Post
Alliant doesn't recommend magnum primers with Unique in the .357 Magnum. I'd rely on their expertise.
The older genuine Alliant and Hercules manuals used Federal 200 primers with all loads and powders, even Bullseye and Red dot. The current published Alliant data isn’t the data originally developed by them.
Reply With Quote
  #16  
Old 07-03-2022, 12:36 AM
jem102 jem102 is offline
Member
357 Mag small pistol or small pistol mag primers 357 Mag small pistol or small pistol mag primers 357 Mag small pistol or small pistol mag primers 357 Mag small pistol or small pistol mag primers 357 Mag small pistol or small pistol mag primers  
Join Date: Jun 2021
Location: East TN
Posts: 166
Likes: 283
Liked 174 Times in 81 Posts
Default

I gave up on pistol pistol primers, standard or mag, for my full .357 "magnum" loads years ago and only use Federal 200 Small Rifle.
Reply With Quote
The Following 2 Users Like Post:
  #17  
Old 07-03-2022, 02:35 PM
Eddie Southgate's Avatar
Eddie Southgate Eddie Southgate is offline
Member
357 Mag small pistol or small pistol mag primers 357 Mag small pistol or small pistol mag primers 357 Mag small pistol or small pistol mag primers 357 Mag small pistol or small pistol mag primers 357 Mag small pistol or small pistol mag primers  
Join Date: Sep 2016
Location: Southern Middle Tennessee
Posts: 1,078
Likes: 2,546
Liked 1,428 Times in 589 Posts
Default

Quote:
Originally Posted by sbrmike View Post
I have never used Small Pistol Magnum Primers in my 357 Magnum 158 grain .358" diameter L-SWC loads over 6.0 grains of Unique. Does anyone recommend the magnum primers for this load?
No. No need for mag primers with Unique.
__________________
Grumpy Old Man With a Gun
Reply With Quote
  #18  
Old 07-03-2022, 02:57 PM
CH4's Avatar
CH4 CH4 is offline
Member
357 Mag small pistol or small pistol mag primers 357 Mag small pistol or small pistol mag primers 357 Mag small pistol or small pistol mag primers 357 Mag small pistol or small pistol mag primers 357 Mag small pistol or small pistol mag primers  
Join Date: Jul 2014
Location: Sin City
Posts: 7,469
Likes: 14,240
Liked 16,336 Times in 4,850 Posts
Default

Quote:
Originally Posted by venomballistics View Post
You could use magnums in it, but there's no logical reason to support it outside availability.
That’s correct
__________________
FBINA 213th Session
Reply With Quote
  #19  
Old 07-12-2022, 03:45 AM
Bill Lear Bill Lear is offline
Member
357 Mag small pistol or small pistol mag primers 357 Mag small pistol or small pistol mag primers 357 Mag small pistol or small pistol mag primers 357 Mag small pistol or small pistol mag primers 357 Mag small pistol or small pistol mag primers  
Join Date: Dec 2017
Location: Clovis, California
Posts: 220
Likes: 135
Liked 277 Times in 113 Posts
Default

Magnum small pistol primers aren't just about explosive material quantity. The most important aspect is primer cup thickness. I would recommend loading .357 magnum loads with magnum primers for the thicker cup...primers are the main weakness of small-primer handgun cartridges because even the magnum versions have thin cups. In fact, if your hammer system can handle it I'd recommend working all loads up using small magnum RIFLE primers to get the super-thick cups that don't flatten out like velum at 36K psi.
Reply With Quote
  #20  
Old 07-15-2022, 07:03 PM
antonio_oc antonio_oc is offline
Member
357 Mag small pistol or small pistol mag primers 357 Mag small pistol or small pistol mag primers 357 Mag small pistol or small pistol mag primers 357 Mag small pistol or small pistol mag primers 357 Mag small pistol or small pistol mag primers  
Join Date: Feb 2021
Location: Newport Beach, CA
Posts: 3
Likes: 1
Liked 2 Times in 2 Posts
Default Go magnum

Literally ALL reload manuals say to use small pistol magnum primers. I only use them and I've been successful with hot loads H110 Hornady XTP 125 and 158 grains projectiles.
You're free to use what you want, but I have a 100% success and still have all my fingers, I'll stick with that.

Last edited by antonio_oc; 07-15-2022 at 07:04 PM.
Reply With Quote
The Following User Likes This Post:
  #21  
Old 07-15-2022, 07:49 PM
Racer X Racer X is offline
Member
357 Mag small pistol or small pistol mag primers 357 Mag small pistol or small pistol mag primers 357 Mag small pistol or small pistol mag primers 357 Mag small pistol or small pistol mag primers 357 Mag small pistol or small pistol mag primers  
Join Date: Aug 2009
Location: Seattle
Posts: 2,350
Likes: 621
Liked 2,091 Times in 966 Posts
Default

Quote:
Originally Posted by venomballistics View Post
You could use magnums in it, but there's no logical reason to support it outside availability.
Most of the primers I have purchased in the past 2 years, have been magnum primers, because those were the ones not being purchased by others. 1K of large rifle magnum, and 1 k of small pistol magnum. Small pistol magnums can be easily made to work in small pistol or small rifle brass.

Last edited by Racer X; 07-15-2022 at 07:50 PM.
Reply With Quote
The Following User Likes This Post:
  #22  
Old 07-15-2022, 09:28 PM
342ti 342ti is offline
Member
357 Mag small pistol or small pistol mag primers 357 Mag small pistol or small pistol mag primers 357 Mag small pistol or small pistol mag primers 357 Mag small pistol or small pistol mag primers 357 Mag small pistol or small pistol mag primers  
Join Date: Oct 2017
Posts: 213
Likes: 20
Liked 152 Times in 90 Posts
Default

I've loaded 357/44 mag for years, NEVER bought a mag primer in my life. I use 2400 exclusively, but standard primers worked 100% with 110 and 296 as well.
Reply With Quote
  #23  
Old 07-15-2022, 09:28 PM
DWalt's Avatar
DWalt DWalt is offline
Member
357 Mag small pistol or small pistol mag primers 357 Mag small pistol or small pistol mag primers 357 Mag small pistol or small pistol mag primers 357 Mag small pistol or small pistol mag primers 357 Mag small pistol or small pistol mag primers  
Join Date: Dec 2009
Location: South Texas
Posts: 29,785
Likes: 50
Liked 23,451 Times in 11,797 Posts
Default

Right now, you use whatever type of primers you can find. Not a good time to be choosy.
Reply With Quote
The Following 4 Users Like Post:
  #24  
Old 07-15-2022, 09:43 PM
ArchAngelCD's Avatar
ArchAngelCD ArchAngelCD is offline
Moderator
357 Mag small pistol or small pistol mag primers 357 Mag small pistol or small pistol mag primers 357 Mag small pistol or small pistol mag primers 357 Mag small pistol or small pistol mag primers 357 Mag small pistol or small pistol mag primers  
Join Date: Dec 2006
Location: Northeast PA, USA
Posts: 7,577
Likes: 735
Liked 3,730 Times in 2,038 Posts
Default

Quote:
Originally Posted by 342ti View Post
I've loaded 357/44 mag for years, NEVER bought a mag primer in my life. I use 2400 exclusively, but standard primers worked 100% with 110 and 296 as well.
I'm happy to hear you have had no problems with W296/H110 with standard primers but when used with Magnum primers the powder burns more completely and the ES and SD numbers drop in most cases.

Slow hard to ignite powders like W296/H110, W540/HS-6, W571/HS-7 ( both HS-7 and W571 are now discontinued) and other powders like them shoot better when set off with magnum primers.
__________________
Freedom is never free!!
SWCA #3437
Reply With Quote
  #25  
Old 07-15-2022, 09:49 PM
Chubbs103 Chubbs103 is offline
US Veteran
357 Mag small pistol or small pistol mag primers 357 Mag small pistol or small pistol mag primers 357 Mag small pistol or small pistol mag primers 357 Mag small pistol or small pistol mag primers 357 Mag small pistol or small pistol mag primers  
Join Date: Nov 2007
Location: Ridgecrest, CA
Posts: 548
Likes: 21
Liked 600 Times in 234 Posts
Default

Quote:
Originally Posted by antonio_oc View Post
Literally ALL reload manuals say to use small pistol magnum primers.
Negative.

My Speer manual lists small pistol primers for most loads. They list magnum primers for loads using certain powders (W296, HS-6, HS-7, etc.)

edited to add: I was concerned about the age of my Speer manual (12th edition, 1995). Their online data still has magnum and standard primers based on powder.

additional edit: I removed mention of a different manual as there was no mention of Mag primers for any loads using small pistol primers leaving things ambiguous.

Last edited by Chubbs103; 07-16-2022 at 03:06 AM.
Reply With Quote
  #26  
Old 07-16-2022, 07:39 AM
alwslate alwslate is offline
Member
357 Mag small pistol or small pistol mag primers 357 Mag small pistol or small pistol mag primers 357 Mag small pistol or small pistol mag primers 357 Mag small pistol or small pistol mag primers 357 Mag small pistol or small pistol mag primers  
Join Date: Dec 2009
Location: Indiana
Posts: 5,646
Likes: 2,447
Liked 5,550 Times in 2,388 Posts
Default

Quote:
Originally Posted by 342ti View Post
I've loaded 357/44 mag for years, NEVER bought a mag primer in my life. I use 2400 exclusively, but standard primers worked 100% with 110 and 296 as well.
Don’t own a chronograph do you? If you did you would see how extremely poor your handloads with 110/296 and standard primers actually are.
Reply With Quote
The Following 3 Users Like Post:
  #27  
Old 07-17-2022, 08:57 AM
243winxb 243winxb is offline
Member
357 Mag small pistol or small pistol mag primers 357 Mag small pistol or small pistol mag primers 357 Mag small pistol or small pistol mag primers 357 Mag small pistol or small pistol mag primers 357 Mag small pistol or small pistol mag primers  
Join Date: Nov 2001
Location: USA
Posts: 111
Likes: 67
Liked 66 Times in 36 Posts
Default Remington Primers 1 1/2 or 5 1/2 Answered or more confusing?

Remington primers- https://www.ssusa.org/content/reming...istol-primers/


Indeed, Remington’s ballistics tables list the recommended primers for each caliber that Remington loads, handgun and rifle. The 1½ primers are listed for the 25 Auto, .32 S&W, .32 S&W Long, .32 Auto, .380 Auto, .38 S&W, .38 Short Colt and .38 Special. None of these cartridges exceed 25,000 psi peak chamber pressure limits. Surprisingly, the 1½ primer is also listed for the 9mm Luger, the 9mm +P and .38 Super. These latter calibers are not low pressure. The 9mm Luger has a SAAMI (Sporting Arms and Ammunition Manufacturers’ Institute) pressure limit of 35,000 psi, and the +P version’s limit is 38,500 psi. The .38 Super has a SAAMI pressure limit of 36,500 psi. These compare with the .357 Magnum and .40 S&W pressure limit of 35,000 psi, and the .357 SIG’s limit of 40,000 psi. If the 1½ primer is not appropriate for the .357 Magnum and .40 S&W, how can it be appropriate for the 9mm, 9mm +P and .38 Super, which have the same—or even higher pressure limits?

This has caused confusion among some reloaders, myself included. In fact, I was unaware of this warning when I first bought 1½ primers and used them in 9mm Luger loads. I thought the 1½ primers were “standard” primers, and the 5½ primers were “magnum” primers, since that is how they are listed in many primer charts.

Last edited by 243winxb; 07-17-2022 at 08:59 AM.
Reply With Quote
The Following 2 Users Like Post:
  #28  
Old 07-20-2022, 11:18 PM
PapaWheelie PapaWheelie is offline
Member
357 Mag small pistol or small pistol mag primers 357 Mag small pistol or small pistol mag primers 357 Mag small pistol or small pistol mag primers 357 Mag small pistol or small pistol mag primers 357 Mag small pistol or small pistol mag primers  
Join Date: Nov 2019
Location: Oshkosh, WI
Posts: 70
Likes: 90
Liked 27 Times in 19 Posts
Default

Quote:
Originally Posted by DWalt View Post
Small Rifle primers will work just as well. Pretty much identical to a SPM primer. I have used SR primers only in all of my .38 Special and .357 loads for many years, and even in several other calibers.
In my 686 I have been loading sub 1000 fps target loads with True Blue and, due to availability, have been using small pistol, small pistol magnum, and small rifle primers without any problems. No signs of any pressure issues and if there is any affect on accuracy, it's too small for me to notice.
Reply With Quote
  #29  
Old 07-21-2022, 05:30 AM
GeoJelly GeoJelly is offline
Member
357 Mag small pistol or small pistol mag primers 357 Mag small pistol or small pistol mag primers 357 Mag small pistol or small pistol mag primers 357 Mag small pistol or small pistol mag primers 357 Mag small pistol or small pistol mag primers  
Join Date: Oct 2000
Location: NOVA
Posts: 1,275
Likes: 4,671
Liked 1,203 Times in 519 Posts
Default

I have been using SRP in all of my handgun loads this year because of the paucity of SPP. I’ve had zero issues, firing in Glocks and my cheapie Beretta APX, due to the thicker cups. All of my reloads are mild pressure-wise so no concern with using small rifle primers. As others have stated, I am reasonably sure that SRP = SPM.
Reply With Quote
  #30  
Old 07-21-2022, 07:20 AM
rosewood rosewood is online now
Member
357 Mag small pistol or small pistol mag primers 357 Mag small pistol or small pistol mag primers 357 Mag small pistol or small pistol mag primers 357 Mag small pistol or small pistol mag primers 357 Mag small pistol or small pistol mag primers  
Join Date: Oct 2019
Location: Georgia
Posts: 1,319
Likes: 2,227
Liked 1,002 Times in 537 Posts
Default

Quote:
Originally Posted by 243winxb View Post
Remington primers- https://www.ssusa.org/content/reming...istol-primers/


Indeed, Remington’s ballistics tables list the recommended primers for each caliber that Remington loads, handgun and rifle. The 1½ primers are listed for the 25 Auto, .32 S&W, .32 S&W Long, .32 Auto, .380 Auto, .38 S&W, .38 Short Colt and .38 Special. None of these cartridges exceed 25,000 psi peak chamber pressure limits. Surprisingly, the 1½ primer is also listed for the 9mm Luger, the 9mm +P and .38 Super. These latter calibers are not low pressure. The 9mm Luger has a SAAMI (Sporting Arms and Ammunition Manufacturers’ Institute) pressure limit of 35,000 psi, and the +P version’s limit is 38,500 psi. The .38 Super has a SAAMI pressure limit of 36,500 psi. These compare with the .357 Magnum and .40 S&W pressure limit of 35,000 psi, and the .357 SIG’s limit of 40,000 psi. If the 1½ primer is not appropriate for the .357 Magnum and .40 S&W, how can it be appropriate for the 9mm, 9mm +P and .38 Super, which have the same—or even higher pressure limits?

This has caused confusion among some reloaders, myself included. In fact, I was unaware of this warning when I first bought 1½ primers and used them in 9mm Luger loads. I thought the 1½ primers were “standard” primers, and the 5½ primers were “magnum” primers, since that is how they are listed in many primer charts.
This is an epiphany I have had recently. I have heard the argument for the thicker primer for the higher pressures, but as you stated, 9mm and 40 both run pressures the same or higher than 357 mag, but I have never seen any load data call for mag primers in either, so that debunks that argument.

Only argument I have heard that does make sense is that some powders need a hotter flame to burn consistently. And that some ball powders such as H110 may burn fine at normal temps, but in cold weather environments, that is when you really start to have hang fires and the like and a mag primer will take care of that.

Other conclusion I have come to. Magnum in a cartridge title is used in a different context than Magnum in a primer name. 2 different uses of the term. In a cartridge, it was really just a marketing name to sell products. In the primer, it really means a hotter flame and also varies from manufacturer to manufacturer.

For example, a .270 Winchester runs higher pressures than a 7mm Rem Mag. And as you stated, the 9mm and 40 may run higher pressures than a 357 mag and 44 mag.

Rosewood
Reply With Quote
  #31  
Old 07-21-2022, 09:08 AM
gwpercle's Avatar
gwpercle gwpercle is offline
Member
357 Mag small pistol or small pistol mag primers 357 Mag small pistol or small pistol mag primers 357 Mag small pistol or small pistol mag primers 357 Mag small pistol or small pistol mag primers 357 Mag small pistol or small pistol mag primers  
Join Date: Nov 2011
Location: Baton Rouge, La.
Posts: 6,358
Likes: 6,474
Liked 7,234 Times in 3,333 Posts
Default

The powder and to some extent the amount of that powder determines when a magnum primer is used .
Ball powder and large charges of slow burning powder like 2400 and H110 can benifit from magnum primers .

Unique is a medium burning , easily ignited powder .
6.0 grains is not a large amount ... no magnum primer needed ... BUT ...
If all you have are magnum primers ... in this load you could use a magnum primer and get a few extra feet per second in velocity .
It will not create dangerous pressure in a 6.0 grs. Unique load ( a max. load like 7.0 grs would call for a reduction but 6.0 grs. is fine) ... you might even get a bit better accuracy in the 357. magnum case .
Load up a few and test them ... the primer shortage is causing a lot of folks to start using magnum primers because that's all they have left and/or all they can get !
Gary
__________________
Certified Cajun
NRA Member

Last edited by gwpercle; 07-21-2022 at 09:12 AM.
Reply With Quote
The Following User Likes This Post:
  #32  
Old 08-06-2022, 03:45 PM
boatbum101 boatbum101 is offline
Member
357 Mag small pistol or small pistol mag primers 357 Mag small pistol or small pistol mag primers 357 Mag small pistol or small pistol mag primers 357 Mag small pistol or small pistol mag primers 357 Mag small pistol or small pistol mag primers  
Join Date: Oct 2005
Location: Pensacola,FL
Posts: 1,688
Likes: 3,925
Liked 960 Times in 515 Posts
Default

Lately I've found mag primers are more readily available & priced cheaper than std . Large rifle all I've seen are CCI 34's & Ginex .
Reply With Quote
  #33  
Old 08-06-2022, 04:11 PM
rockquarry rockquarry is online now
Member
 
Join Date: Aug 2005
Posts: 5,136
Likes: 4
Liked 5,873 Times in 2,761 Posts
Default

Quote:
Originally Posted by sbrmike View Post
I have never used Small Pistol Magnum Primers in my 357 Magnum 158 grain .358" diameter L-SWC loads over 6.0 grains of Unique. Does anyone recommend the magnum primers for this load?
Regardless of whether you are loading with Unique or other powders, use what primers you have or what you can find. Your gun, your components, and your shooting skill are different from those of others.

I've seen slightly better accuracy with a magnum primer, #2400 powder, and a 160 gr. SWC cast from an H&G #51 mould and fired in a 6" Python vs. the same with a standard primer. Hardly definitive proof of anything.

Try both primers (or as many varieties as you can find) and fire some ten-shot groups benchrested at 25 yards. A chronograph would be handy, but not necessary. If you use a chronograph, look at the velocity figures and check the target for group size; don't fixate on SD and ES numbers which are very secondary.
Reply With Quote
  #34  
Old 08-07-2022, 12:10 AM
Dfish1247 Dfish1247 is offline
Member
357 Mag small pistol or small pistol mag primers 357 Mag small pistol or small pistol mag primers 357 Mag small pistol or small pistol mag primers 357 Mag small pistol or small pistol mag primers 357 Mag small pistol or small pistol mag primers  
Join Date: Oct 2020
Posts: 167
Likes: 22
Liked 165 Times in 70 Posts
Default

I’ve tried spm and srp in 800-950fps unique,win244, and aa5 loads in 357 brass, 158gr plated and jacketed rn and swc, they do burn cleaner than sp in my experience.

2400,h110, and 4227, I started at the minimum, I found the accuracy I was after with the charges lower down the spectrum vs what sp achieved, not every gun is the same obviously, but you get the idea. 2400 and 4227 were rancid filthy with regular sp’s, h110 wasn’t nearly as bad as those two.
Reply With Quote
  #35  
Old 08-07-2022, 01:11 AM
ArchAngelCD's Avatar
ArchAngelCD ArchAngelCD is offline
Moderator
357 Mag small pistol or small pistol mag primers 357 Mag small pistol or small pistol mag primers 357 Mag small pistol or small pistol mag primers 357 Mag small pistol or small pistol mag primers 357 Mag small pistol or small pistol mag primers  
Join Date: Dec 2006
Location: Northeast PA, USA
Posts: 7,577
Likes: 735
Liked 3,730 Times in 2,038 Posts
Default

Like I said above, the need for a magnum primer is powder driven, not by the word Magnum in the cartridge. IMO Unique and 2400 don't require a magnum primer. They are very old powders which were formulated well before magnum primers were ever thought of. Hard to ignite ball powder are the magnum primer candidates.
__________________
Freedom is never free!!
SWCA #3437
Reply With Quote
The Following User Likes This Post:
  #36  
Old 08-13-2022, 12:46 AM
pantannojack's Avatar
pantannojack pantannojack is offline
US Veteran
357 Mag small pistol or small pistol mag primers 357 Mag small pistol or small pistol mag primers 357 Mag small pistol or small pistol mag primers 357 Mag small pistol or small pistol mag primers 357 Mag small pistol or small pistol mag primers  
Join Date: Jun 2011
Location: the ready line, N. Idaho
Posts: 852
Likes: 484
Liked 1,033 Times in 446 Posts
Default

I have been trying 6g Unique with both hard mix and reclaimed range lead 158g LSWC gas check, sized .357, (what I got), with both standard and Magnum primers, in 357 case. Accuracy is shotgun cylinder choke. In a 586 4" same bullet over 4.1g 231 in 38 spcl case with std primer is more near one hole at 10 yds.
__________________
"Don't Give Up the Ship"
Reply With Quote
Reply

Thread Tools
Display Modes

Posting Rules
Forum Jump

Similar Threads
Thread Thread Starter Forum Replies Last Post
substitute small rifle primers for small pistol magnums in 357? irapollock Reloading 7 12-16-2021 09:10 PM
Small rifle primers use in small pistol apps NJM15 Reloading 31 05-15-2014 09:14 AM
Small Pistol Primers vs. Magnum Small Pistol Primers palmetto99 Reloading 5 02-10-2011 10:03 PM
WTT CCI magnum small pistol primers for standard small pistol primers Black_Sheep Accessories/Misc - For Sale or Trade 1 09-07-2009 11:47 AM
Ok what is the difference between Small Pistol and Small Rifle primers? dennis40x Reloading 24 03-09-2009 07:38 AM

Powered by vBadvanced CMPS v3.2.3
smith-wessonforum.com tested by Norton Internet Security smith-wessonforum.com tested by McAfee Internet Security

All times are GMT -4. The time now is 12:06 PM.


Smith-WessonForum.com is not affiliated with Smith & Wesson Holding Corporation (NASDAQ Global Select: SWHC)