I have had my 9mm M11A1 4 years and total round count is 2000 +/-. I have never experienced any FTF or other malfunctions with it. Recently, I tried some 147 grain Federal HST ammo. I had 4 FTF over 26 rounds, 2 each over a 13 round magazine. Different spots each time. Previously, I have always shot 115gr and 124 grain ammo. I have used the same 147gr ammo in my Legion 226 have not had any issues.

Appreciate your thoughts.

Are you using the older 13rd magazines or the 15rd magazines the gun was designed to use?

quote:

Originally posted by mbacker_99:
Are you using the older 13rd magazines or the 15rd magazines the gun was designed to use?

All Sig 15 rounders. I had just loaded them to 13.

FWIW, The 147 HST I tried was very soft shooting, even though it was +P. I chronographed some. In my SIG MK 25 with 4.4" barrel it only averaged 986FPS. I haven't used the non +P version, but can only imagine that it is slower yet. Within my humble experience, some of this low energy ammo displays marginal functional reliability in some pistols....ymmv

Those sub sonic rounds have a reduced charge to stay below 1100 fps. I can forsee failures in a 229, especially with a light grip, with sub sonic rounds. Spring weight and slide mass play a role as well

quote:

Originally posted by HayesGreener:
Those sub sonic rounds have a reduced charge to stay below 1100 fps. I can forsee failures in a 229, especially with a light grip, with sub sonic rounds. Spring weight and slide mass play a role as well

Not in this case. The reason this particular ammo is subsonic is that it is 147 grain 9mm round.

Please describe the malfunction in detail. Three point jam? FTF is a broad term.

Thanks guys for your inputs.

I definitely don't have a light grip. That is not the issue. I would describe the failure as a nose up failure to chamber. So the previous case clears fine, the next round is partially stripped but only makes it half way to the chamber and jambs in an angle up position.

453030, do you have a caliper, digital or otherwise? Measure the overall length of the 147’s and compare that number to rounds that you know function. OA length is probably what your running into. Some firearms can’t handle the bigger (longer bullets).

quote:

Originally posted by beltfed21:
453030, do you have a caliper, digital or otherwise? Measure the overall length of the 147’s and compare that number to rounds that you know function. OA length is probably what your running into. Some firearms can’t handle the bigger (longer bullets).

I have an architectural measuring tool I can use. Good idea, I'll check on it. Thanks my friend.