I have been shooting 7,000 psi STS shells using the Harten Crimp, Clays, 1 oz. with 2 1/2" cut hulls. Since it takes much longer to make the Harten Crimp with overshot cards I compromised by reducing my loads to 5,500 psi in 2 3/4" STS shells using PB. I see no real difference in their effectiveness. The PB seems softer to shoot, though. The difference in the cost of the overshot cards makes up for the more expensive powder although I really do it to reduce the time I spend at the loader.

So many guns, so little time!