Hi,
I've scored some of Starline's Cowboy Special brass. They are used for shorter 45 Colt cartridges. They have the length of 45 ACP, but can be loaded into 45 Colt revolvers, although they won't work in a lever gun. The idea is that a smaller case allows for more of the case to be filled because the 45 Colt was made for black powder.
To do a crimp, the main suggestion is to use a 45 ACP crimp die (using Lee Factory Crimp) because the seating die is just too long to put a crimp on these shorter cases.
However, when I do that, the bullet pops out of the case to above the lube grove! I am pretty sure that it happens on the upstroke, but I'm not sure. I've alternated out both Lee and RCBS dies. I've tried light to very big crimps.
If I take this now-partially-seated cartridge, then run it back through the seating and crimping process, I get an okay cartridge. However, I am finding rings of shaved lead when I re-seat it.
Any ideas?