It was suggested in a "survival" website that .410 shotshells can be fired in a 45-70 for small game. I haven't compared the dimensions yet but the shotshell would certainly produce less chamber pressure than the rifle cartridge. The rifling would disturb the shot pattern, of course, but at close range it might not be important.
Does anyone know if this is feasible? It might be fun!
Does anyone know if this is feasible? It might be fun!