Very interesting and helpful thread. I was planning on doing what MSG Glenn suggested. I have been able to get my hands on practice ammo, and now started focussing on jhp for SD, including +p. Just wanting to try a few different brands and see what I like.
+p ammo in MP9C
- Thread starter JeffF64
- Start date
Brien
Member
Seems like most say 147g is the max. I accidentally bought Hornady Critical Duty 220g last week. I didn't know it was for long barrel 9's. Should I avoid shooting it in this gun? I only got a box for personal defense.
MichiganScott
Member
If it's truly 220gr, it isn't 9mm.
danysw
Member
Agree 100%
Brien
Member
That's what the specifications say.
smokey0118
Member
critical duty for 9mm is 135 gr and 135 gr +p. I have both, have shot both. They don't expand that much, but penetrate like a sumbitch. You're looking at roughly .55" expansion and about 15-16" of penetration out of the 135+p. the 220 gr is 45acp.
Brien
Member
Thank you, I stand corrected.
Most, if not darn near all police agencies issue either Plus P or Plus P pluss ammunition as their duty rounds in 9mm, and in the day's of yore, .38 Special. If they were to cause a danger to the officers I seriously doubt they would be issued and reuired for use. Will they creat more or fast wear on the weapon? Yes. Is it significant with limited use? I seriously doubt it.
smokey0118
Member
You do have to be careful with which +p+ you use as there is no SAAMI spec for it.
9mm is spec'd at 35,000PSI
9mm+p is spec'd at 38,500PSI
9mm NATO is spec'd at 36,500PSI
there's nothing as a maximum for +p+...hence the danger. You've got to be a little in to reloading and looking for overpressure signs like flattened primers and cases that are expanding too much in different dimentions to get a feel for if the +p+ cartridge is pushing beyond what your gun should be handling.
Often, the small ballistic advantage of a +p+ over a regular +p or even a standard heavy-for-caliber loading is offset by the increased rapport, muzzle flip, and flash is also produces.
I have fired a couple boxes of the +P and have had no issues, didn't even really notice a difference in kick between my 115 grain frankly.... maybe just a tad. At $1 a shot I don't feel like testing how many it will shoot, but the manual doesn't say not to use them. It does say not to shoot +p+, but it doesn't say not to shoot +p.
Arik
Member
Been shooting +p for years in my MPs, HKs and Glocks. No problems. I shoot on avg of one box of +p per range session
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OP
JeffF64
US Veteran
Thanks all for the advice, glad this thread assisted others as well.
