Do you mean all brass shells ? I never had any luck loading nitro powder in brass shells, but I believe Charlie has. I believe it has to do the the crimp because that is the part that along with the shot presents the resistance for pressure to build in a shotgun shell. Factory brass shells have a crimp. When I loaded them it was with BP and the overshot wad was glued in. Not a whole lot of resistance there, but it seemed to work with BP. I think Charlie pushes and holds the OS card down when gluing. There's a guy here in Mi. who has shot steel out of a full choked Parker for years with no damage. Good luck.
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Paul Harm
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