M&P Pro 40 - Failure to Feed Issue

[Parks2055]

Hello Folks,
I have a new M&P 40 Pro that is having failure to feed issues.
Round is getting stuck on the feed ramp. Not a mag problem - happens with several.
It is worse with lighter loads which I can understand with everything being tight and stiff recoil spring in a new pistol.
But, I have seen a couple posts for the same issue where it was suggested that shorter COL may be the issue.
What COL are people using for the M&P 40 Pro. I have been using 1.125 (getting 1.122 to 1.128 variance).
Should I push it out to 1.135 or even a little longer 1.140?
Suggestions are much appreciated.
Thanks,

 

[Skylerbone]

Is there a discernible pattern to the failures, particular bullet style, length, load, magazine or cartridge number (first cartridge from full magazine, etc.)? Can the problem be duplicated with factory ammo?

Length will depend on bullet profile and you don't specify what you are using. I'm at 1.125 with Nosler HPs, the same with Hornady's XTP HP without any failures.

 

[wildehond]

I use truncated code bullets and the OAL I use is 28,8 mm to the "fllaptop" of the bullet. That translates to about 1,1339". It is in a Glock 22 though, but it should not make much difference. I load for about 950 fps with 180gr bullets.