I have a Colt Frontier 44 Spl and a Henry Big Boy 44. My father hand loaded shot shells for the Colt years ago. He has now passed and left me the Colt and about 50 shot shell / cases. He made the shot shells from 30-40 Craig cases with wads he made himself. I've not been able to duplicate his process! I'm concerned about using mag cases and the effect the shot may have on the Henry chamber. Any thoughts?