+p ammo..

+p ammo..

This is a discussion on +p ammo.. within the Defensive Ammunition & Ballistics forums, part of the Defensive Carry Discussions category; why is there 9mm, 45 acp and a few other +p ammo but not .40 S&W?...

Results 1 to 4 of 4

Thread: +p ammo..

  1. #1
    Member Array johnnyrigger's Avatar
    Join Date
    Oct 2007
    Eagle River,Alaska

    +p ammo..

    why is there 9mm, 45 acp and a few other +p ammo but not .40 S&W?

  2. #2
    VIP Member Array dukalmighty's Avatar
    Join Date
    Feb 2008
    40 S&W is a high pressure load any increase would cause over pressure in guns and cause lots of kabooms
    "Outside of the killings, Washington has one of the lowest crime rates in the country,"
    --Mayor Marion Barry, Washington , DC .

  3. #3
    VIP Member
    Array falcon1's Avatar
    Join Date
    Jan 2006
    Quote Originally Posted by dukalmighty View Post
    40 S&W is a high pressure load any increase would cause over pressure in guns and cause lots of kabooms
    +1. 9mm, .45 ACP, and .38 Special are relatively old loads, and there are a lot of older firearms and older designs chambered for them, not all of which are up to higher pressures. Hence the +P designation, generally safe in more modern firearms (follow manufacturer guidance, of course). The .40 S&W is such a new cartridge that manufacturers have confidence in the metallurgy of the firearms and the designs, so they loaded the cartridge to what would have been "+P" pressures from the get-go.
    If the public are bound to yield obedience to laws to which they cannot give their approbation, they are slaves to those who make such laws and enforce them.--Samuel Adams as Candidus, Boston Gazette 20 Jan. 1772

    Veteran--USA FA
    NRA Benefactor Life
    Tennessee Firearms Association Life

  4. Remove Advertisements

  5. #4
    VIP Member Array Rob72's Avatar
    Join Date
    May 2005
    Or something like that. .40 S&W was to replicate 9mm velocity with a .40 cal bullet. The only firearm that didn't experience serious failures initially when feeding it was the USP- which was specifically designed around the cartridge. The "other guys" beefed up their 9mm barrels & frames with inconsistant success.

Sponsored Links

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts

Similar Threads

  1. Ammo vs Ammo: Win. 147gr -Hornady Critical Defense
    By Saltybob2 in forum Defensive Ammunition & Ballistics
    Replies: 17
    Last Post: July 27th, 2012, 11:27 PM
  2. WTT (MS only): 10mm & .357Sig ammo for .45ACP ammo...
    By TheGreatGonzo in forum Member Buy, Sell & Trade
    Replies: 1
    Last Post: January 5th, 2009, 12:00 PM
  3. Attempt at Ammo Ban (Ammo Serialization) in Arizona!
    By swift in forum The Second Amendment & Gun Legislation Discussion
    Replies: 40
    Last Post: February 20th, 2008, 05:55 PM
  4. dedicated magazines for carry ammo and range ammo?
    By Chris17404 in forum Concealed Carry Issues & Discussions
    Replies: 23
    Last Post: December 21st, 2006, 08:37 AM
  5. An Old Revolver With Old Ammo: The H&R 629 and Federal Champion Target Ammo
    By Joshua M. Smith in forum General Firearm Discussion
    Replies: 0
    Last Post: September 28th, 2006, 02:07 PM