This is my first try at lead bullets in .40 S & W.
Bullets are LEE 401-175 TC water dropped wheel weights + 2 % tin and sized to .401" or .400" in diameter. Powder is Alliant Power Pistol, 5.7 grains. Primer is lead free from PMC.
The top row of the picture were fired in a Glock, bottom row in a Beretta. I have changed primer brands, changed the powder charge up and down, changed brand of cases and changed the bullet diameter. All loads have an OAL of 1.135". The appearance of fired primers appears to be consistent in all of my tests.
The primers in the bottom row appear to me to have a circular raised area around the firing pin detent. I am concerned that this may be an indication of excessive chamber pressure. I would appreciate any opinions as to what's going on here.