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+p and +p+

Reddot47Reddot47 Member Posts: 2,279 ✭✭✭✭✭
edited February 2007 in Ask the Experts
What makes a 9mm ammo +p and +p+?
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Comments

  • Laredo LeftyLaredo Lefty Member Posts: 13,451 ✭✭✭
    edited November -1
    More power and more pressure.
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  • Mr. GunzMr. Gunz Member Posts: 1,621 ✭✭✭
    edited November -1
    +1
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  • tsr1965tsr1965 Member Posts: 8,682 ✭✭
    edited November -1
    Well, when a barrel or firearm is tested, or proof tested at the factory, the pressure of the proof rounds are approximately 1.5 times the designed operating pressure of the cartrige. +P would be a little step up from the standard operating pressure, or about 5% of the span between operating pressure, and proof pressure, above the operating pressure. The +P+ is about 10%. This by no means a free pass to experiment on the reloading bench. The +P, and +P+ loads were developed under strict testing conditions, using pressure transducers, and strain guages. The +P+ used to be marketed as LAW ENFORCEMENT ONLY also.
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  • nunnnunn Forums Admins, Member, Moderator Posts: 36,085 ******
    edited November -1
    Personally, I think both designations are more marketing gimmicks than anything else. Bigger is better! More power!
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  • tsavo303tsavo303 Member Posts: 8,913 ✭✭✭
    edited November -1
    And be aware each gun ca handle different ammounts
    Glocks are fine with +p+, most are not
    hk, sig fine w +P
    beretta 92 I would only fire +p in limited amounts, etc
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  • SP45SP45 Member Posts: 1,761 ✭✭✭
    edited November -1
    For +P you can find loading data and have a SAAMI spec. +P+ have no SAAMI spec therefore you do not know what the pressure is. There are several agencies who have contracted with an ammo company to make a specific +P+ loading for a specific purpose and specific firearm. This does not mean that these rounds are safe in every firearm chambered for the same cal. These guns generaly wear out much sooner and have more maintenance issues and parts breakage.
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