Damaged cases.

[dearslayer]

I have run into similarly damaged casings in the past. I always narrowed it down to too much recoil spring. Slide comes back too slow to kick out the casing properly and crushes it on the return... I almost always find them still stuck in the slide but not always! Your loads seem like they should be sufficient but if you aren't the original owner maybe a 24lbs spring or something silly is installed.? Depending on many things even 18lbs could cause issues like this. Building .45 Super and Rowland 1911s has presented me with this problem several times.

The LGS I took the slide to said the spring was much too heavy and might not even be the original one and he suggested a 13lb Wolf spring with a reduced load of 3.1 - 3.2 vihtavuori N310. I haven't installed one yet but I have noticed consistent dents on most spent cases near the case edge.