M*CARBO Brotherhood

+P Ammo In Sub2k?

To me that’s the rhino in the room

I get why a MFR says no to it when they’re giving ya a lifetime warranty

But I am wondering what people’s actual experience shooting it is

Those near 357 ballistic stats are impressive, but that’s with +p rounds


We are already getting a pretty good increase in velocity just by virtue of the 16 inch barrel in the Sub2K vs the 3-5 inch barrels typical of the handguns we are carrying. If shooters are concerned about pushing the envelope too far, then go in a different direction, use lighter faster rounds and avoid any excessive chamber pressures. Not that I believe there is a serious danger of the gun exploding, but hot rounds are harder on the action and can shorten the life of some critical parts. I am going to be testing out some Interceptor ARX rounds in both my 40cal, Glock 27 and my Sub2k. They are 88gr. and listed at 1420fps out of a 4 inch barrel. I also got some in .45 cal 112gr. at 1350fps. That’s going to be interesting in my Sig 1911.


I ran a few mags of Federal HST 124gr +p through mine to check for function because that’s what I carry in my Glock 9mms. No problems, but I wouldn’t make a steady diet of it. Too expensive anyway.


Thanks for the detail. I hear you on the lighter round. Still, I’m impressed by the foot pounds of 147 grain 9mm +p generates

I was sooo tempted by the 40 cal sub ballistic


I just run cheap ball through mine on the range. However, I have Hornady Critical Duty 135 gr 9mm +P in magazines that I hope I never use for self-defense. I’ve run a couple of magazines through it to check for gun and magazine function and am not at all worried about it. It still eats cheap ball like a starving hyena.


Thanks for confirming, that’s the same reason why I would as well.


Hey Al … I’ve heard that the critical duty +p is one of the softer +p rounds out there. If you agree with that, might be a good solution for Sub and carry gun. You’re probably already aware but the FBI choose this round

And hey … Off topic but look how much you’ve come out of the closet posting wise!


What about firing Liberty Civil Defense ammo 50gr 9mm+P 2000 fps , 450 FPE, 2" dispersion @ 25m, 12" penetration @ 10ft Was able to get my hands on one box but haven’t fired any yet.


I’d run the Liberty Defense. It actually has a reduced recoil impulse based on my limited experience with the 40 offering. The recoil impulse was reported to me by a retired LEO friend I connected with this load so he could complete his qualification following a hand surgery.


If it’s already going out at 2000 fps in a handgun it may be a little too fast out of a 16 in. barrel. Excessive speed beyond what a round was designed for may cause it to fragment on impact and not achieve the optimum penetration level. But, the proof is in the testing. Give it a try.



Welcome to the MCarbo Brotherhood, Dennis!

1 Like

Called Keltec directly. Told them it wasn’t listed in owners manual like it always should be. Told me regular and +P ONLY, just like the Glock 19 I own. Never use +P+ In Keltec Sub 2000 or any Glock, as +P+ is greater or less than +P. You will never know exactly what that +P+ pressure is.