Ammo 9mm vs 9mm +p

Is 9mm +p ammo good to use on a sig 365xl and SW 9mm M&P 2.0 ? any response is greatly appreciated.

Thanks.

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Welcome to the Community @Luis_A3 .

Yes, 9mm +P ammo is good to use in SIG365XL and M&P9 M2.0.
Both manufacturers make their models ready for “+P” and “+P+” ammunition.

Standard 9mm loads are 35,000 PSI
+P loads are 38,500 PSI
+P+ loads are 42,000 PSI

Good barrel should handle up to 70,000 PSI.

If your M&P is a Compact version then, like for SIG365XL, “+P” ammo would be more effective in self defense situations.
Shorter barrel makes muzzle velocity slower than long barrel, so to have better bullet expansion it’s a good idea to speed it up by adding pressure and muzzle velocity.

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Welcome Luis! My suggestion would be to refer to the owner’s manual for each of those handguns.

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Should be in your manual. Quick read

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Yeah only because you’re faster than me

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Welcome to the community @Luis_A3 !

+P should be fine in either of those though there are many standard pressure self defense rounds that would be equally effective in them without the extra recoil.

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Hello and welcome @Luis_A3

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Kinda remembered that Sig said not to use +P+, but had to look it up.

From the Sig website’s FAQ:

Can I use +P or +P+?

+P Ammo manufactured to SAAMI/CIP/NATO specs is fine to use as a defensive round or for occasional range use. Continual use of this round will make it necessary for more frequent service on the pistol. We do NOT recommend the use of any +P+ round. This may void your warranty.

https://www.sigsauer.com/faqs

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Welcome to the family brother @Luis_A3 , glad you enjoyed us.

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IMO, if there is a 9mm +P that you are interested in, take it to the range, compare it to a standard 9mm loading, see if it works for you and works well in your firearm, and if so go for it. I would recommend more stringent following of the manufacturers recoil spring replacement interval if shooting a lot of +P rounds… especially on these miniaturized firearms.

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Thank you everyone, I appreciate all of the quick responses and welcomes to the USCCA community. also, thanks for the advice. Be safe.

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YES, I agree with this.
Unfortunately “+P+” is not specified by SAAMI and that’s the reason nobody wants to play with this under warranty… what actually makes sense from manufacturer’s perspective.

+P is OK for sure, no doubt.
+P+ is OK also with most of new handguns, but like you mentioned, it may void the warranty, if specified by manufacturer.

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Never shot a 365, but see how you like the recoil shooting +p in it first, before investing heavily. I know my subcompacts get feisty shooting NATO 9mm, which is similar…They are mellower with my +p defensive rounds which are 147 grain, but still snappier than a standard load.

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I think I have posted this before, but this is an extract from the Springfield 1911 Manual:

image

I called and quizzed Springfield regarding this extract. The person I talked to said the barrel is strong enough for +P ammo, but the failure mechanism, i.e., the weakest link is usually the frame cracks after extended use of +P ammo. This is especially a factor in the “light-weight” models with aluminum frames. They said don’t worry about sporadically shooting +P ammo, just don’t do it all the time.

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What does your owner’s manual say?

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If addressed towards me, the section in red is what the manual says. I only shoot standard loads other than a periodic small sample of +P self defense ammo.

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Heresy alert, up front.

The USA-made 9mm ammo has almost always been underloaded from its European pressure standards. When the cartridge was first rolled out c. 1902, it featured a 123-124 grain FMJ RN or truncated-cone bullet running in the 1250 FPS ZIP Code. That sort of performance gets a “+P” rating in this country, though in truth it is a bit of a misnomer.

My 9mm carry arm is a SIG P-226. It is filled with Speer Lawman Gold Dot 124 grain +P ammo. These clock ~1225-1240 FPS from the 4.4" barrel. Those FBI-touted 147 grain sub-sonic JHP loads barely keep up with the 38 Special’s ballistics–the 124 grain @ 1240 FPS nicely splits the difference between the 38 Special and 357 Magnum/125 grain JHPs. If you select the 9mm as your carry arm, exploit all of its potential–don’t leave performance on the table.

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I spoke with Armscor few months after I bought RIA 1911 TAC. They didn’t see any problem shooting +P ammo.

1911 is a specific example here, because the problem doesn’t sit in the barrel, but action mechanism and all the small, precise parts which don’t exist in striker fired pistols.

Alu frame is another factor, however CZ P-01 Omega (which is aluminum frame) doesn’t have any problem with +P ammo.

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Gary, it was addressed towards @Luis_A3

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I prefer standard 9mm lighter weight (HST 124). It’s very shootable, but the lighter weight leads to more penetration. That being said, I’m carrying plus P right now because of our recent ammo shortage, so I’ll probably be carrying plus P for a couple more years (just because I have it, looks like ammo is making a comeback, hope it’s not short lived).

I’d definitely test out the plus p in a smaller gun. There is a substantial difference. That being said, I don’t want to over think it. I have quality hollow points that function, plus p or not, I’ll be happy :+1:.

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