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Old 01-18-2020, 03:36 PM
PapaWheelie PapaWheelie is offline
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Default Loads for 38 Special in 357 brass

I don't want to shoot 38 brass in my 357 due to the powder ring in the cylinder and the fact that 357 brass is all I have. I do however want to shoot the loads given with the various powders/lead bullets for 38's to keep velocities down to the mid 800's or there about. Is there a conversion factor somewhere to compensate for the longer brass or is one even required?
Thanks.

Last edited by PapaWheelie; 01-20-2020 at 06:21 PM. Reason: misspelling
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Old 01-18-2020, 03:45 PM
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Shooting .38 Spl in a .357 mag cylinder is no big deal. Some will have you believe the dreaded lead ring will make it impossible to use .357 casings ever again...

Clean the gun after shooting, I use a .40 brush.....no more ring around the collar..play on words there.

The only time I have seen it needed to do this is in SASS where some .357 rifles will only feed .357 brass. Oft times the .38 spl brass is simply too short for the lifter to reliably feed.

Randy

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Old 01-18-2020, 03:48 PM
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Well, Speer #10 shows 4.3gr of Bullseye behind a 158gr lead SWC or RN at 848 fps for 357 Mag. You ought to be able to find something that works for you.
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Old 01-18-2020, 03:52 PM
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Just bump the charge weight that is shown in 38 special load data for the bullet you're using . Lets take 148 HBWC loads for instance , classic in 38 special is 2.7grs Bullseye . In a 357 case with a 148 HBWC use 2.9grs Bullseye . To get 800fps with a 148 HBWC in a 357 case use 3.3grs Bullseye with an OAL of 1.360" . Slower powders you'll have to figure out , but just bump powder charge .2 - .3grs to start with . Another classic load for 148 in 38 is 3.1grs W231 , in a 357 bump it to 3.4grs to start & adjust to desired velocity . Don't go crazy as with a HBWC you can blow the skirt off the bullet & if you shoot another behind it you'll bulge your barrel . Personally I'd use a 38 case , bump load .2 to .3 grs & seat bullet out of case neck to an OAL of 1.360". Can do the same with a 158 SWC or RN only use OAL of 1.455"with say 3.7 to 4.0grs W231 or 4.7 to 5.0grs of Accurate # 5 .
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Old 01-18-2020, 04:05 PM
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Oh dear . . . the dreaded .38-caused carbon ring. I guess gun cleaning is too old school. I shot .38s for years in my Ruger BH .357, often 100s of rounds at a time, and not once was there ever a carbon-ring issue.
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Old 01-18-2020, 04:10 PM
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If you go on Hodgdon's data site, pull up 38 spl and 357 mag with the same weight Hornady FTX bullet, same powder, and with the same powder charge, both measured from a 4" barrel, the 357 shows more fps even though it has greater case volume. The gun can mean as much as the cartridge.
boatbum101 does have a good general rule to follow. Unless your at max load, bumping up the powder charge .2 grains should compensate for the extra case volume.
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Old 01-18-2020, 04:20 PM
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Quote:
Originally Posted by boatbum101 View Post
Don't go crazy as with a HBWC you can blow the skirt off the bullet & if you shoot another behind it you'll bulge your barrel . Personally I'd use a 38 case , bump load .2 to .3 grs & seat bullet out of case neck to an OAL of 1.360". Can do the same with a 158 SWC or RN only use OAL of 1.455"with say 3.7 to 4.0grs W231 or 4.7 to 5.0grs of Accurate # 5 .
I'm pretty new at this - could you tell be what you mean when you said you can blow the skirt off? I have not reloaded HDWCs, yet but have been using the Acme 158 LSWC with the hi-tek coating.

I have a little OCD when it comes to cleaning stainless. Many years ago I shot 38 brass in a 686 and those rings in the cylinders used to drive me crazy. Right or wrong, it's too late to change me now. I have a lot of 357 brass and use coated bullets mainly to cut down on cleaning time. I do want to experiment with different powders and coated bullets though, and have done a lot of searching on the various powder web sites, and even bought a book. Most of the recipes that I want to try are written for the 38 case however.
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Old 01-18-2020, 04:31 PM
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'm pretty new at this - could you tell be what you mean when you said you can blow the skirt off?"

You get two holes in a target because the bullet comes out in two pieces. You HOPE it always comes out..and doesn't leave a skirt in the barrel!!
HBWC are for light loads of powders like bullseye and HP38. If you want to go faster use DEWC, NOT HBWC.

By the way I shoot tens thousands of .38 in a Model 66 in IDPA, and use a Hoppes Tornado brush to get the lead/carbon ring out of the cylinder in a couple of swipes. Easy and quick.
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Old 01-18-2020, 04:37 PM
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Do some searching; there is data out there though some of it may have started out in paper manuals. If I chose to use .357 cases, I'd take .38 Special data and bump it up slightly with successive loads and shoot groups from a solid benchrest setup, chronographing at the same time. I'd go with what was most accurate for my gun.

I've never seen the carbon ring and I shoot only .38 Special in my .357 Magnum guns.

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Old 01-18-2020, 05:15 PM
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I wouldn't even bother myself. Just use the mid-range 38 special recipe as is. The load will be a few fps slower than the same load in a 38 special case, but so what?

It isn't like low-end 38 specials are so slow and under powered that they are going to stick in the barrel or anything.

Think about it, the 38 long Colt using the same bullet is loaded to lower pressures and velocities than the 38 special and they still make it out the end of the barrel, right?

A few fps due to the 10% larger case volume just isn't going to make that big of a difference. Worst case scenario if they aren't fast enough for you, use the top end of the 38 special charge weight. A max 38 special load isn't going to be all that hot in a 357 case.
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Old 01-18-2020, 05:19 PM
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Quote:
Originally Posted by PapaWheelie View Post
I'm pretty new at this - could you tell be what you mean when you said you can blow the skirt off? I have not reloaded HDWCs, yet but have been using the Acme 158 LSWC with the hi-tek coating.

I have a little OCD when it comes to cleaning stainless. Many years ago I shot 38 brass in a 686 and those rings in the cylinders used to drive me crazy. Right or wrong, it's too late to change me now. I have a lot of 357 brass and use coated bullets mainly to cut down on cleaning time. I do want to experiment with different powders and coated bullets though, and have done a lot of searching on the various powder web sites, and even bought a book. Most of the recipes that I want to try are written for the 38 case however.
Look down in the case. That is a skirt blown off. I was making a target load for my 19 using 3.2 of American Select at 25y. This happened several times. I couldn't make it do that with Bullseye powder. Here is the target and the far right hole is where the sliver of lead went and stuck in the board. The sliver in on the duct tape I was using to sight in. The lower hole in the group was that shot. I happened to have a spotter telling me the shots.
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Old 01-18-2020, 05:46 PM
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Quote:
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Look down in the case. That is a skirt blown off. I was making a target load for my 19 using 3.2 of American Select at 25y. This happened several times. I couldn't make it do that with Bullseye powder. Here is the target and the far right hole is where the sliver of lead went and stuck in the board. The sliver in on the duct tape I was using to sight in. The lower hole in the group was that shot. I happened to have a spotter telling me the shots.
Wow, did not know that could happen. That would be a day wrecker if stuck in the bore without knowing.
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Old 01-18-2020, 05:53 PM
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Quote:
Originally Posted by PapaWheelie View Post
I don't want to shoot 38 brass in my 357 due to the powder ring in the cylinder and the fact that 357 brass is all I have. I do however want to shoot the loads given with the various powders/lead bullets for 38's to keep velocities down to the mid 800's or there about. Is there a conversion factor somewhere to compensate for the longer brass or is one even required?
Thanks.
Just what bullets do you plan on reloading. I shoot 38 specials in my 357 guns and shoot 38 special loads in 357 cases all the time. Like has been said itís not magic vodoo. Pick a bullet and load for 38 special and adjust powder charge slightly by a couple grains higher.
I have loaded lots of 38 special loads in 357 cases without adjusting the charge. However I normally do not start at the lowest load and usually start a few grains higer if using 357 cases.
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Old 01-18-2020, 06:04 PM
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Oh dear . . . the dreaded .38-caused carbon ring. I guess gun cleaning is too old school. I shot .38s for years in my Ruger BH .357, often 100s of rounds at a time, and not once was there ever a carbon-ring issue.
My intent was not to start 38 vs 357 brass. It's really not that I don't want to clean my gun, it's because I must have them spotless after each session. When I shot with 38 brass I did get rings that were easy to see against the s/s. Tried many different brushes and cleaners to remove them too.
I just don't want to do it anymore. So far 357 brass and coated bullets make for easy cleanup for me and as a casual shooter it works.
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Old 01-18-2020, 07:17 PM
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I shoot 38 brass in my Model 65 all the time. Hoppes #9 and a nylon .40 brush with strands of copper from a Chore Boy pad in a cordless screwdriver makes cleaning up 150 rounds of residue a less than 5 minute chore.
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Old 01-18-2020, 07:52 PM
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Quote:
Originally Posted by PapaWheelie View Post
My intent was not to start 38 vs 357 brass. It's really not that I don't want to clean my gun, it's because I must have them spotless after each session. When I shot with 38 brass I did get rings that were easy to see against the s/s. Tried many different brushes and cleaners to remove them too.
I just don't want to do it anymore. So far 357 brass and coated bullets make for easy cleanup for me and as a casual shooter it works.
Ha ha that reminds me of me. When I got my first stainless S&W I was so anal about not having a spot of anything on or in it. Used every chemical and mechanical items known to man to keep that baby like new.
Now with the ones that I shoot a lot with they get a quick but good cleaning of barrel and cylinder chambers/throats.
However the carbon rings on the end of the cylinder gets a quick brushing with a brass brush and Ballistol as Iíve learned to live with the ring and life is so much better.
But there is nothing wrong with what you want to do and I commend you for it.
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Old 01-18-2020, 08:07 PM
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I load .38 power loads in .357 brass. Same for .44 mag brass. Works just fine.
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Old 01-18-2020, 08:29 PM
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Just what bullets do you plan on reloading. I shoot 38 specials in my 357 guns and shoot 38 special loads in 357 cases all the time. Like has been said itís not magic vodoo. Pick a bullet and load for 38 special and adjust powder charge slightly by a couple grains higher.
I have loaded lots of 38 special loads in 357 cases without adjusting the charge. However I normally do not start at the lowest load and usually start a few grains higer if using 357 cases.
A "couple of grains"????

I hope you mean a couple tenths of a grain.

As was stated, just increase the .38 load by about 10% and you will have the very near equivalent load in a .357 case.

Don't use hollow base wad cutters. Ever. I suggest using 158 grain semi-wadcutter bullets.
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Old 01-18-2020, 08:35 PM
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PapaWheelie, I am convinced that guns are damaged more from cleaning than from shooting. Clean it, but forget about making it look "spotless". You can do it.

That said, I do understand the desire to use .357 brass in a .357 revolver.
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Old 01-18-2020, 08:52 PM
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Quote:
Originally Posted by Warren Sear View Post
A "couple of grains"????

I hope you mean a couple tenths of a grain.

As was stated, just increase the .38 load by about 10% and you will have the very near equivalent load in a .357 case.

Don't use hollow base wad cutters. Ever. I suggest using 158 grain semi-wadcutter bullets.
Yes I do mean tenths. Trying to post on this iPhone with my left hand while my right arm is in a sling is not working so well.
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Old 01-18-2020, 08:54 PM
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^^^^BTDT!
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Old 01-18-2020, 08:54 PM
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If you shoot 38s in a 357 you get a ring. I get that. But if you shoot 357s in a ss revolver, don't you still get a ring, but its just further down?
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Old 01-18-2020, 09:47 PM
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If you are willing to try Alliant Green Dot I have some load data, including chronyed info, that I can send you. Will need an actual email address for attachment.
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Old 01-18-2020, 11:45 PM
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Quote:
Originally Posted by Warren Sear View Post
A "couple of grains"????

I hope you mean a couple tenths of a grain.

As was stated, just increase the .38 load by about 10% and you will have the very near equivalent load in a .357 case.

Don't use hollow base wad cutters. Ever. I suggest using 158 grain semi-wadcutter bullets.
I caught that too, figured just a typo. I have been using 158 grain hi-tek coated SWC's and RNFP's -so far cleanup has been a breeze even when using Unique. After looking at those pictures I won't fool with hollow base anything. I agree with the comment that more harm is done to a firearm, handgun or long gun, by aggressive cleaning than most anything else.

Consensus seems to be to bump the 38 load by a couple 10ths to 10% or so and go from there. Seems logical and I'll start there. Thanks for all the responses, awesome forum.
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Old 01-19-2020, 08:31 AM
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Might want to reconsider just using a faster/bulky powder. Red Dot, HP-38 and trail boss work very well in various magnum cases for slower velocity loads.
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Old 01-19-2020, 09:54 AM
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I have loaded a lot of 357 Magnum brass to 38 Special ballistics. 38 Special load data is where you start, but due to the larger case capacity of the magnum brass, you will need to increase the load by 0.2 to 0.5 grains, depending upon the powder.
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Old 01-19-2020, 10:35 AM
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Very interesting thread, but I have found some contradicting data from Hodgdon's online data manual. Most folks here seem to agree that a slight bump in powder weight using 357 brass is beneficial, however Hodgdon appears to claim the opposite! I used their calculator and selected 148gr HBWC & HP-38 for both calibers, their results:
38 SPECIAL
3.5-4.0 grains, 869-956 fps
357 MAGNUM
3.0-3.4 grains, 845-908 fps

Note the MAX load for 357 is BELOW the 38 STARTING load ??????????
Very confusing to say the least! I think I've lost my faith in Hodgdon's calculator. Any thoughts?
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Old 01-19-2020, 11:00 AM
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Default 357Rem Mag 38Spl Velocities

Hello all S&W Reloading Enthusiasts.

My current go to reload for plinking with the
357Rem Mag reload:
38/357 .358dia. 148gr Lead DECW Double End
Wad Cutter.
3.0grs Alliant Red Dot, CCI SP #500 primer.
Brass is 357 Winchester, or R-P.

Crimp is what I call medium roll crimp.
FPS approximately 750?

Bullets are tumble lubed with Ben's Liquid Lube
for Lead Free barrel performance.
Primers no where near flat.

The thing about Red Dot is it has enough bulk,
that it is easy to visually see a double charge.
I'm a single stage, small batch reloader anyway.

Other powders I've used and like are; Bullseye,
Unique, American Select.

Be Safe, the Best to you and your Endeavors.
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Old 01-19-2020, 02:05 PM
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Perhaps this topic could become a stickie? I have been using 38 Special data in 357 Magnum brass since about a year after I got my 357 Magnum in '87. I use data straight out of my manuals for loading 38 data in 357 brass, and no "formula". Just remember the listed data for 38 Special, velocities/pressure, in 357 brass will be higher than what is actually achieved. But on that same note; I have never had a bullet stuckm in my 4" 357's barrel, even wadcutters with 3.0 gr of Bullseye...
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Old 01-20-2020, 12:57 PM
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Quote:
Originally Posted by noshow View Post
Very interesting thread, but I have found some contradicting data from Hodgdon's online data manual. Most folks here seem to agree that a slight bump in powder weight using 357 brass is beneficial, however Hodgdon appears to claim the opposite! I used their calculator and selected 148gr HBWC & HP-38 for both calibers, their results:
38 SPECIAL
3.5-4.0 grains, 869-956 fps
357 MAGNUM
3.0-3.4 grains, 845-908 fps

Note the MAX load for 357 is BELOW the 38 STARTING load ??????????
Very confusing to say the least! I think I've lost my faith in Hodgdon's calculator. Any thoughts?
Simple: The limit is caused by the HBWC; it has nothing to do with the powder pressure. So it is NOT a usual MAX load due to pressure concerns. In my experience , even a MINIMUM load of Green Dot can blow the skirts off HBWC!!
Added: And the more air space you have under a HBWC, the more likely it will blow the bullet into two pieces, maybe even sticking the skirt. It has to do with forming a pressure wave, like leaving an air space above a black powder ball, which can bulge the barrel. Internal ballistics do not lend themselves to intuition, or "common sense" based on what we think we know, but most don't. Using a short cartridge and seating the HBWC right down on the powder is safer.
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Old 01-20-2020, 02:35 PM
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Originally Posted by OKFC05 View Post
Simple: The limit is caused by the HBWC; it has nothing to do with the powder pressure. So it is NOT a usual MAX load due to pressure concerns. In my experience , even a MINIMUM load of Green Dot can blow the skirts off HBWC!!
I'm not speaking about the low limit and understand the fragility of the HBWC. In both examples I cited the bullet was a HBWC. My point was that Hodgdon suggests a heavier charge of the SAME powder with the SAME bullet in 38SPL cases vs 357MAG cases! Go figure???????
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Old 01-20-2020, 02:57 PM
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Very interesting thread, but I have found some contradicting data from Hodgdon's online data manual. Most folks here seem to agree that a slight bump in powder weight using 357 brass is beneficial, however Hodgdon appears to claim the opposite! I used their calculator and selected 148gr HBWC & HP-38 for both calibers, their results:
38 SPECIAL
3.5-4.0 grains, 869-956 fps
357 MAGNUM
3.0-3.4 grains, 845-908 fps

Note the MAX load for 357 is BELOW the 38 STARTING load ??????????
Very confusing to say the least! I think I've lost my faith in Hodgdon's calculator. Any thoughts?
Besides what OKFC05 posted above, I can give you a most probable mechanical issue limiting the 357 Mag data with that bullet. What I think you are seeing with this data is due to the test setup they are using for both calibers. They are most probably using a closed chamber test barrel for testing both 38 Special and 357 Mag and most probably using the same test barrel to measure both. Since 38 Special cases are only physically different from 357 Magnum in length only, a 38 Special round shot out of a barrel that can chamber both cartridges would treat the 38 Special rounds as a closed chamber gun that has a very long leade or freebore and helps lower chamber pressures and possibly give a little more velocity, since the skirt will swell out to help seal the smooth bore section before the rifling.
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Old 01-20-2020, 06:09 PM
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Quote:
Originally Posted by noshow View Post
Very interesting thread, but I have found some contradicting data from Hodgdon's online data manual. Most folks here seem to agree that a slight bump in powder weight using 357 brass is beneficial, however Hodgdon appears to claim the opposite! I used their calculator and selected 148gr HBWC & HP-38 for both calibers, their results:
38 SPECIAL
3.5-4.0 grains, 869-956 fps
357 MAGNUM
3.0-3.4 grains, 845-908 fps

Note the MAX load for 357 is BELOW the 38 STARTING load ??????????
Very confusing to say the least! I think I've lost my faith in Hodgdon's calculator. Any thoughts?
I've been looking at different powders to try and am considering a ball powder like Hodgdon/Winchester 231 to use next. It's a little faster than Unique and readily available in my area. I've read that ball powders meters well so it's worth a try. This is from the Hodgdon site;

38 Special - 158 gr. cast LSWC - 7.7" barrel
3.1 - 3.7 grains 782 - 834 fps 11,900 - 14,600 CUP

357 Magnum -158 gr. cast LSWC - 10" barrel
3.4 - 5.0 grains 796 - 1,109 fps 12,600 - 23,900 CUP

In this case I think this pretty much bears out what those above have been saying. Bumping up the 38 starting load a couple of tenths seems to produce similar results. Using a 10" barrel on the 357 must skew things a bit but can't think it's huge.
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Old 01-21-2020, 12:23 AM
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Just clean your gun after shooting it, problem solved. I love the smell of Hoppes or Ballistol. My Old Model BlackHawk .357 loves cast 158gr .38 loads with Unique. Have a hard time switching to 357 brass when these shoot groups you can cover with a quarter ; at 25 yards.
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Old 01-21-2020, 12:48 AM
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Default You can use EXACTLY....

You can use exactly the same loads in .357 cases as you use in your .38 loads. That smidge of extra length isn't enough in old revolver cases (which began with Black Powder loads) to make any difference in volume a problem at all. It's only purpose is to prevent loading a .357 into a .38 special gun.
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Old 01-21-2020, 10:52 AM
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If you use a 38 special load in a 357 case ES & SD will be high & most of the time accuracy will suffer . Pressure will also be lower which will cause the above & it also affects powder burn . All powders have a pressure range that they burn efficiently . Above or below that your results will suffer . You can chose to use same powder & increase the charge in the larger case , chose a slower powder with appropriate charge or use the smaller case & seat your bullet out with an adjusted charge .
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Old 01-21-2020, 12:05 PM
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Using 357 brass, 4 grains of Bullseye behind a 158 gr lead SWC is accurate and easy shooting in my 4" 19-3.
If you have lots of 357 cases, use them. There's no real need for using 38 Special cases.

John
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Old 01-21-2020, 12:21 PM
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Read somewhere it's like 10% but I generally just play around midrange til I find the accuracy I'm happy with. You are shooting SP level loads in a Magnum so high pressure isn't an issue. 4gr of Green Dot under a 158gr LSWC has been working for me.
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Old 01-21-2020, 01:18 PM
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I'll add my 0.02 here. I load all of my 357 cases down to around 38 spl velocity. I don't mind shooting 38 cases in my 357 but I have so many 357 cases I just use those. Alliant has some load data for what they call "cowboy" loads that appear to be about 38 spl velocity or maybe a tad hotter but they work really well in 357 cases using 158 SWC bullets which is what I use.
Here's the link.

Alliant Powder - Reloader's Guide

I use Amarican Select but Unique would probably work just as well. I've never tried Unique so don't know. These are max loads. Start 10% below listed load and work up. AS is an exceptionally clean burning powder. I use it for 38 spl, 9x19, 357 mag lite and 45 ACP.

Good luck.
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Old 01-21-2020, 05:47 PM
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Originally Posted by TIMETRIPPER View Post
Using 357 brass, 4 grains of Bullseye behind a 158 gr lead SWC is accurate and easy shooting in my 4" 19-3.
If you have lots of 357 cases, use them. There's no real need for using 38 Special cases.

John

I asked the question originally because I bought 1500 once fired 357 brass from Capital Cartridge and have a total of two 38 brass that got mixed in in error.
Bullseye seems to be a very popular powder here, I will have to try it. Thanks
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Old 01-21-2020, 05:56 PM
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Have a hard time switching to 357 brass when these shoot groups you can cover with a quarter ; at 25 yards.
A less than one inch group at 25 yards? Young man, you have obviously never seen me shoot. 3 out of 7 just in the black is a good day
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Old 01-21-2020, 06:36 PM
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I asked the question originally because I bought 1500 once fired 357 brass from Capital Cartridge and have a total of two 38 brass that got mixed in in error.
Bullseye seems to be a very popular powder here, I will have to try it. Thanks
Bullseye meters better but is dirtier than American Select. I've tried Bullseye and went to AS. The burn rates, load data and MV are very similar. I would try them both and see which one you like the best.

Happy trails.
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Old 01-21-2020, 10:05 PM
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A man just can't go wrong with Bullseye or Unique in a .38 or .357!
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Old 01-21-2020, 10:30 PM
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A less than one inch group at 25 yards? Young man, you have obviously never seen me shoot. 3 out of 7 just in the black is a good day
Forgot to mention that is with a well rested gun. not freehand. My shooting is more like yours freehand. But if the guns shoots good rested you cant blame It.
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Old 01-22-2020, 01:52 PM
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Nothing wrong with just loading the long .357 cases for the weapon.

In my 686 6" a " .38 special load " in my weapon tested out at;

110 Jhp Red Dot 945fps to 1305fps with Unique powder.
135 Jhp Unique 860fps to 1035
158 Lwc Trail Boss 755fps to 1014 with Unique

Sorry, I do not shoot the 148gr out of my 357 Magnum revolvers, which are reserved for my J frames.

I do not hot rod the little 110 Jhp in my .357's and seldom use them even from the 1254
to over 1500fps that I did test out.

The 125 Jhp is the minimum weight that I think, works in this weapon from a full load of w231/CFE
fast powders to SR4756 and IMR2400 for loads from 1450 to 1500fps.

158 Lwc loads starting with Trail Boss around 790fps for target work
up to 1100 to 1200fps Unique powder loads for longer range work to
full loads around 1320 for hunting but these may start leading the barrel.

The 158 XTP bullet with IMR2400 can get up to 1340fps as a second choice for a hunting load.

For general plinking loads with a Jacket coating you might try down loading the Hornady 140 gr bullet.
They shoot great in my revolvers and the price is right.

Ps;
with a .357 case you are actually shooting a "Reduced" 357 load, not a .38 special load.
Carry on.

Last edited by Nevada Ed; 01-29-2020 at 02:08 PM.
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Old 01-22-2020, 03:59 PM
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Quote:
Originally Posted by growr View Post
Shooting .38 Spl in a .357 mag cylinder is no big deal. Some will have you believe the dreaded lead ring will make it impossible to use .357 casings ever again.......Clean the gun after shooting, I use a .40 brush.....no more ring around the collar..play on words there........Randy
I second Randy completely. I shoot almost all lead. in 38spc/44spcl. Occasionally, I'll load up some magnums. Even then I usually shoot lead. In 357 mag cases however, Hodgdon has loads published that are 38 spcl pressure in Universal and 38+P pressure in Tightgroup loads. I haven't tried the Tightgroup yet, but the Universal is a standard load of mine.
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Old 01-28-2020, 03:50 PM
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Quote:
Originally Posted by Fishslayer View Post
Read somewhere it's like 10% but I generally just play around midrange til I find the accuracy I'm happy with. You are shooting SP level loads in a Magnum so high pressure isn't an issue. 4gr of Green Dot under a 158gr LSWC has been working for me.
I use 3.1 grains of Bullseye under a 148 grain WC for my target 38 Special loads. If I was loading for 357 I'd do a tad less than a 10% increase in powder weight with Bullseye = 3.4 grains. Might start at 3.3 grains of Bullseye.
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