I know this subject has probably been beaten to dust But... I just got a screaming deal on a military model Remington rolling block with a great bore and was thinking about putting it to work. What can .43 Spanish be made from that's not as expensive as Bertram cases. Will .348 Winchester or .50-90 sharps work I'm not worried about forming or trimming. I can get everything needed except brass Maybe I should have it bored out to .50-70 Govt.