Can 451 ball double barrel muzzle loader leinad be converted to a 410 double barrel judge?

NO, not safely anyway. the black powder guns use a much larger barrel pivot pin that their firearm counterparts. to switch from the black powder to accept a 410 barrel you would have to drill out the pivot pin hole on the .410 barrel to accept the larger pin, the black powder barrel support arm is thicker, to account for this....the .410 barrel support arm will become to thin from the drilling making it prone to creak or break.... need anything leinad related? guns, parts, kits, pictures, advice? contact me. xthexheadx@gmail.com