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9mm Ballistics Help
#1
I have a S&W M&P 9 (full size). I normally carry 124 grain +p Federal HST which produces (at the muzzle) 1200 feet per second (fps) and 396 ft/lbs.

I have a box of Speer Gold Dots in 115 grain +p+. This round produces (at the muzzle) 1300 fps and 432 ft/lbs.

Will the 115 +p+ rounds inflict a considerable amount of damage to my M&P 9 or will I be fine? Also Speer Gold Dots in 124 grain +p produce (at the muzzle) 1220 fps and 410 ft/lbs, and are a little more powerful than Federal HSTs.

Note: I usually only run 10 rounds of SD ammo through my carry guns (once every 3-6 months) to test functionality and will NOT be feeding my M&P or other carry guns a steady diet of +p or +p+.
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#2
I cant answer your question patriot but I tested my new 9mm shield this past Mon. and at 15 ft 124 grain federal HP regular loads went strait through the phone book and took rather large pieces of cinder block out also. I dont think you really need +P+. Something else to consider is there is no "standard" or specific specs for +P+ is there?
das, proud to be a member of pa2a.org since Sep 2012.
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#3
das;145323 Wrote:Something else to consider is there is no "standard" or specific specs for +P+ is there?

Nope, and because of that, I know a lot of people say +p+ is a marketing gimmick. I'm going to watch some youtube test videos and look more into the subject.
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#4
Philadelphia Patriot;145338 Wrote:
das;145323 Wrote:Something else to consider is there is no "standard" or specific specs for +P+ is there?

Nope, and because of that, I know a lot of people say +p+ is a marketing gimmick. I'm going to watch some youtube test videos and look more into the subject.
Certainly do that. You dont need your gun blowing up on you.
das, proud to be a member of pa2a.org since Sep 2012.
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#5
Philadelphia Patriot;145321 Wrote:I have a S&W M&P 9 (full size). I normally carry 124 grain +p Federal HST which produces (at the muzzle) 1200 feet per second (fps) and 396 ft/lb.

I have a box of Speer Gold Dots in 115 grain +p+. This round produces (at the muzzle) 1300 fps and 432 ft/lb.

Will the 115 +p+ rounds inflict a considerable amount of damage to my M&P 9 or will I be fine? Also Speer Gold Dots in 124 grain +p produce (at the muzzle) 1220 fps and 410 ft/lb. and are a little more powerful than Federal HST’s.

Note: I usually only run 10 rounds of SD ammo through my carry guns (once every 3-6 months) to test functionality and will NOT be feeding my M&P or other carry guns a steady diet of +p or +p+.


This thread’s a little old; but, because the information is useful, I’ll answer it: Briefly, if you’re using a modern pistol in good mechanical condition you shouldn’t have a problem with any of the commercially marked +P ammunition. The only precaution I’d suggest is that your pistol's recoil spring should be in good condition and rated at standard, or better, poundage.

(WARNING: There ARE certain guns out there that are marked for standard velocity ammo only. (Use your head, read the writing in the owner’s manual, or on the gun's barrel, and proceed accordingly.)

With these precautions in mind, you’re NOT going to hurt your gun by firing an occasional magazine, or two, of +P ammo. While +P ammo's pressure specifications are higher than the usual SAAMI specs, no commercial +P ammo exceeds the proof test pressure for whatever firearm it’s sold for. (Only private reloaders make mistakes like that!) Your commercially manufactured 9 x 19mm +P+ ammo should be fine for occasional use in your S&W M&P pistol. If you want to be extra careful, contact Wolff Gunsprings in Newtown Square, PA and get yourself a heavier than standard recoil spring.

das;145323 Wrote:I ……. Something else to consider is there is no "standard" or specific specs for +P+ is there?


Actually there are published standards or, at least, standards exist for some commercial ammunition that’s marked and sold as, ‘+P’ or, ‘+P+’. For pistol ammunition I believe there are published +P standards for: 38 Special, 9 x 19mm, and 45 ACP ammunition. There is, also, a published standard for 38 Auto (Super); but 38 Super ammunition is such that many authorities consider it to be a separate and distinct caliber, all its own.

So, what about other ammo that’s marked as +P? Here is where the advertising hype comes in. The +P designation means nothing more than, ‘hotter than usual’; and you can be more than reasonably certain that it's well below the manufacturer's established proof test pressure.

Here: http://www.thegunzone.com/+P+_ammo.html Not a perfectly correct article; but close enough. Smile
L'enfer c’est les autres, et les choses terribles qu'ils font!'  -  Jean-Paul Sartre  
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#6
The BEST source for this information is SAAMI!

Go here to get the info straight from the horse's mouth!

http://www.saami.org/specifications_and_...ad/205.pdf
Brick, proud to be a member of pa2a.org since Sep 2012.
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