Smith & Wesson Forum

Go Back   Smith & Wesson Forum > Smith & Wesson Revolvers > S&W Revolvers: 1980 to the Present
Forum Register Expert Commentary Members List


Reply
 
LinkBack Thread Tools Search this Thread Display Modes
  #1  
Old 07-30-2009, 03:35 PM
Member
 
Join Date: Aug 2006
Location: EP MINNESOTA
Posts: 292
Likes: 2
Liked 15 Times in 11 Posts
Default +p meaning?

My 337 is labeled on the side of the barrel as being for "+P Jacketed." What does this mean and why?

Thanks
Ward
Reply With Quote
  #2  
Old 07-30-2009, 03:41 PM
Member
 
Join Date: Aug 2007
Location: Oklahoma
Posts: 5,369
Likes: 560
Liked 1,102 Times in 593 Posts
Default

Cartridge......PSI
38 Special 17,000
38 Special +P 20,000

Jacketed means gilding metal over the lead bullet.

You can also shoot regular .38

Last edited by OKFC05; 07-30-2009 at 03:43 PM.
Reply With Quote
  #3  
Old 07-30-2009, 03:46 PM
USAF385's Avatar
US Veteran
 
Join Date: Apr 2009
Location: NEPA Endless Mountains
Posts: 3,294
Likes: 258
Liked 909 Times in 391 Posts
Default

Non jacketed lead bullets may creep out of the casing in smaller frames. The crimping on the casing doesn't hold onto the lead as well as the FMJ, so with enough vibration and such from firing the gun, the last round may pull out a bit, which could cause problems.

Standard pressure lead rounds are fine. I've yet to have any issues firing lead +Ps through my 642.
__________________
Federalist No. 46
Reply With Quote
  #4  
Old 07-30-2009, 03:56 PM
Phillips7609's Avatar
US Veteran
 
Join Date: Jun 2009
Location: Muscle Shoals, Alabama
Posts: 304
Likes: 0
Liked 0 Times in 0 Posts
Default

While we're on the subject...
Is the .38 +P+ not pushing the .357 threshold as far as pressure goes?
__________________
Ted Nugent in 2013!

Last edited by Phillips7609; 07-30-2009 at 03:58 PM. Reason: changed phrasing of question
Reply With Quote
  #5  
Old 07-30-2009, 04:08 PM
Member
 
Join Date: Aug 2007
Location: Oklahoma
Posts: 5,369
Likes: 560
Liked 1,102 Times in 593 Posts
Default

Quote:
Originally Posted by Phillips7609 View Post
While we're on the subject...
Is the .38 +P+ not pushing the .357 threshold as far as pressure goes?
Who knows? +P+ just means however much over SAAMI pressure the manufacturer chooses. Some are a little over, some a lot.

38 Special 17,000
38 Special +P 20,000

357 Magnum 35,000

270 Winchester 65,000

SAAMI pressure specs

Last edited by OKFC05; 07-30-2009 at 04:10 PM.
Reply With Quote
  #6  
Old 07-30-2009, 04:19 PM
Member
 
Join Date: Jun 2009
Location: Northwest PA
Posts: 15
Likes: 0
Liked 0 Times in 0 Posts
Default

According to the Tech Reps at S&W, .38 +P+ IS NOT recommended in their revolvers.

Pressure levels vary, the case has significantly less volume than a .357 case and can cause spikes in chamber pressure.

The round is basically a "proof load" and not intended for duty or sport. It was orignally developed to duplicate .357 performance in weapons chambered for .38 spl. to avoid the "stigma" of Law Enforcement carrying magnums that could really hurt the bad guys?!

Nayth
Reply With Quote
  #7  
Old 07-30-2009, 05:36 PM
Member
 
Join Date: Aug 2006
Location: EP MINNESOTA
Posts: 292
Likes: 2
Liked 15 Times in 11 Posts
Default

I guess I should have stated my question more clearly as I do know what the +P stands for but was unsure of the "Jacketed" portion of the marking. Thanks for the help guys.

Ward
Reply With Quote
  #8  
Old 07-30-2009, 06:10 PM
Member
 
Join Date: Sep 2007
Posts: 48
Likes: 0
Liked 2 Times in 2 Posts
Default

Quote:
Originally Posted by NAYTH View Post
According to the Tech Reps at S&W, .38 +P+ IS NOT recommended in their revolvers.

Pressure levels vary, the case has significantly less volume than a .357 case and can cause spikes in chamber pressure.

The round is basically a "proof load" and not intended for duty or sport. It was orignally developed to duplicate .357 performance in weapons chambered for .38 spl. to avoid the "stigma" of Law Enforcement carrying magnums that could really hurt the bad guys?!

Nayth
With that said, I can't imagine any .38 +p+ ever doing any damage to an N-Frame chambered for .357 mag.
Reply With Quote
  #9  
Old 07-30-2009, 07:27 PM
magnum12pm's Avatar
Member
 
Join Date: Jan 2007
Location: Central Ohio
Posts: 453
Likes: 0
Liked 2 Times in 2 Posts
Default

I use Federal Premium LE 38+P+ in my carry 357 revolvers. They are no where close to magnums. The are a bit stout, but very controllable. I put them in my revolvers, Model 60 & 327, with one regular 38s, big difference but not extreme.
Reply With Quote
  #10  
Old 07-30-2009, 08:10 PM
exfebee's Avatar
Member
 
Join Date: Jul 2009
Location: North Florida
Posts: 482
Likes: 0
Liked 47 Times in 16 Posts
Default

I also have shot +P+ in my L-Frame 686 for many years. In fact my 4 inch 686 has had over 30,000 rounds shot through it, a great percentage were the +P+ Federals. I can still hit in the k-5 area from 60 years in a decent group.
Reply With Quote
  #11  
Old 07-30-2009, 08:47 PM
SWCA Member
 
Join Date: Nov 2008
Location: Michigan
Posts: 6,034
Likes: 1,061
Liked 619 Times in 300 Posts
Default

Quote:
Originally Posted by WHO CARES View Post
I guess I should have stated my question more clearly as I do know what the +P stands for but was unsure of the "Jacketed" portion of the marking. Thanks for the help guys.

Ward
It simply means that your gun can safely fire +p (pressure) rounds with jacketed bullets. Lead bullets can be loaded to +P levels, but they aren't nearly so hard on the forcing cone or barrel as jacketed bullets are. Your gun can take a steady diet of them without undue wear to the forcing cone, and start of the barrel/bore.
Reply With Quote
  #12  
Old 07-30-2009, 10:45 PM
ChadW's Avatar
US Veteran
 
Join Date: Apr 2009
Location: Pennsylvania
Posts: 210
Likes: 0
Liked 0 Times in 0 Posts
Default

385 got it right about the bullet creep. I've experimented with this in my j frame and have found that if I keep a certain round as my 5th shot, shoot 4 times.. reload.. keeping the same 5th shot at number 5 and continue.. that bullet creep is possible in lead rounds. It usually takes 12 or more shots though.
Reply With Quote
  #13  
Old 07-31-2009, 11:47 AM
Member
 
Join Date: Aug 2006
Location: EP MINNESOTA
Posts: 292
Likes: 2
Liked 15 Times in 11 Posts
Default

Quote:
Originally Posted by Gun 4 Fun View Post
It simply means that your gun can safely fire +p (pressure) rounds with jacketed bullets. Lead bullets can be loaded to +P levels, but they aren't nearly so hard on the forcing cone or barrel as jacketed bullets are. Your gun can take a steady diet of them without undue wear to the forcing cone, and start of the barrel/bore.
That's good as I intend to shoot 99.5% cast bullets - I just like to work in the +P pressure area.
Reply With Quote
  #14  
Old 07-31-2009, 04:05 PM
SWCA Member
 
Join Date: Nov 2008
Location: Michigan
Posts: 6,034
Likes: 1,061
Liked 619 Times in 300 Posts
Default

My post was a little unclear I think. I meant that your gun was rated to shoot jacketed bullets regularly. It should last indefinately with lead bullets, but be aware that +P pressures will loosen the gun much more quickly than standard loads, even if it is rated for +P.
Reply With Quote
Reply

Tags
327, 642, 686, cartridge, chamber pressure, j frame, model 60, n-frame, sig arms, winchester

Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes

Posting Rules
S&W Revolvers: 1980 to the Present Thread, +p meaning? in Smith & Wesson Revolvers; My 337 is labeled on the side of the barrel as being for "+P Jacketed." What does this mean and ...
Similar Threads
Thread Thread Starter Forum Replies Last Post
22/40 Meaning of 40 paplinker S&W Hand Ejectors: 1896 to 1961 17 01-12-2012 09:58 AM
66-3 dash meaning? DUNTOV S&W Revolvers: 1980 to the Present 1 01-12-2011 05:51 PM
Meaning of SD? setxn Smith & Wesson SD & Sigma Pistols 10 07-18-2010 12:18 PM
Meaning of OOB ? fireS&W Smith & Wesson M&P 15-22 32 04-22-2010 06:40 AM
Meaning of "BPD"? big50_1 S&W Revolvers: 1961 to 1980 14 06-30-2009 03:00 PM

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 02:14 PM.


S-W Forum, LLC 2000-2015
Smith-WessonForum.com is not affiliated with Smith & Wesson Holding Corporation (NASDAQ Global Select: SWHC)