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I have this issue when releasing with an empty magazine. With the empty mag you are pushing against the spring pressure that initiates the automatic slide lock when shot to empty.

I have been searching for a reload tha would shoot a good group in my full size M&P40. Shooting plated bullets from Rainier I was getting 5 foot groups at 25 yards. Finally found a load that will group about 5-6 inches at that distance. 180 grain plated truncated cone bullet, 4.0 grains of...

Are you saying the S&W M&P pistols are made in Germany?

Already done that. They got an even bigger group than I did. I also pick up a different pistol, same ammo, and get very good groups. Glock 22, Sig 226 and Colt 1911. I am considering ordering a replacement barrel of a different brand to fix the problem. But, that is a real expensive test.

I am having alot of trouble getting good groups when shooting my M&P-40. I've tried many different loads along with factory ammo. At 25 yards I get groups sometimes3 feet wide. Lots of keyholed bullets. Anyone else have this problem? Anyone recommend a new barrel?

Can you quote the load you are using in the 40 cal with plated bullets. In the M&P-40 and plated bullets I cannot get a stable load. Super huge groups and lot of bullet keyholeing. I've been using Rainers 180 grain plated bullets.

I loaded the ammo hotter than before. In fact a max load according to loading manual. The group shrank dramatically. And the keyholing stopped. I think the result is called obstration, or something like that. The bullet actually expands to fit the rifling of the barrel.

I have to requalify with my duty weapon (M&P40) soon so I went to the local range to practice. First try I shot my usual 40 reload, 180 plated bullet (Renier) & 6 grains of Unique. At 25 yards ity looked like a huge shotgun pattern, some shots off the paper totally. Duty ammo, 180 GoldDots...

My duty weapon is the M&P40 and I am due to requalify this month. At local indoor range I went for practice session. I shot 175 grain LSWC bullets and 180 grain plated TC bullets. Both using Win 231 powder. Problem is I am getting large groups and alot of keyholeing. At 25 years, 15 rounds...