This has just recently started to happen. I'm loading 9mm on my RCBS press, using a variety of brass (range pickup, but mostly my own) and standard RN FMJ 115-grain bullets. Even though I have the expander plug most of the way down inside the case, and the case mouth is clearly belled, it seems to require excessive force to load the bullets. About one in three cases winds up wrinkled. (And yes, if anybody is wondering, the body of the expander die is all the way down and just touching the shell holder when the ram is at the top of its stroke.)
Two questions:
1. Anybody have an idea what's causing this?
2. Is it unsafe to go ahead and shoot this stuff, thus fire-forming the cases?
Two questions:
1. Anybody have an idea what's causing this?
2. Is it unsafe to go ahead and shoot this stuff, thus fire-forming the cases?