I have a 35 Marlin lever I have used with commercial ammunition. I am an experienced hand gun loader but never for the 35. I want to start handloading for my baby but I honestly can't figure where the cartridge head spaces. Seem with a roll crimp it wouldn't be the mouth of the cartridge, but no rim on the back . . . someone fill me in. I consider myself an intelligent reloader rather than jam and pray . . .