Fail to feed in M&P pro 40 S&W

[shotslow]

I am not sure but this maybe should be in the reloading forum. But since it involves specifically a M&P 40 I'll put it here first.

I have loaded a Missouri Bullets 180 grain Lead TC into some mixed cases with 5.0 grains of Win 231. The chronograph tells me this makes major power, 176. Nice load.

I have put 1000 rounds or so through this firearm since I got it at the beginning of the year. The bullets are Missouri Bullets 140 grain lead TC loaded at 1000 fps and 165 grain fmj plated at the same fps at 1009 fps. These have had no problem.

Here is the problem: It is the 180 grain TC. I will shoot 10 to 12 rounds and get a failure to feed. The round hangs up. I can clear it and go one. These 180 grains rounds seem unusually dirty compared to the others rounds. All use 5.0 grains of 231, well the 165 grain fmj use 5.3 grains.


All rounds are loaded with a Lee crimp die. Seating and crimping are separate operations.


I like the 180 grain load, recoil is manageable and accurate compared to me anyway.

Any suggestions on a cure or something I should pay attention to?

 

[OKFC05]

Do you disassemble, clean, and dry your mags?

Is it hanging low or high on FTF? Check length compared to 165gr.

Compared to plated, bullet lube makes the lead bullet load dirty.

 

[shotslow]

They hang high. Twice I just pushed the slide home. I have a Glock 36 that hangs low. I am assuming it is because of overall length. Bullet is too long. Not the case with the 40 S&W M&P 40 S&W. I love saying that

Yes I clean the mags.