Follow up on mine which appears to be working well now I size the primers.

Using 105gr swc home cast boolits (from scrap roofing lead, not range scrap) with Blue Dot powder is giving nice 4" groups freehand at 22 yards, seems consistent. Lubed with Alox, no excessive leading noted.
I'll do some more tests and load development with Herco powder soon now I've got a tub of the stuff.
I'm just glad it's finally shooting a full cylinder properly. Bloody primers!