pamtnman,
I have been confronting the same problem. I have a William Powell & Son
cape gun c.1860. One barrel is a shotgun and the other a 2-groove rifle.
It came with two 30-bore moulds (the British spelling) that are serialized
to it. The conical bullet is .54 in the body and .59 at the outer edge of the
wings. Casting with pure lead, it weighs 490 grains. The two diameters of
the belted ball are the same. The barrel is 29-b so a patch of the appropriate
thickness is necessary. I have a friend who has a 2-groove Purdey and some
original patches. I will try to duplicate what he has.
I have been unable to find any articles on appropriate loading techniques for
the 2-groove winged bullet.
