I have a Lee conical mould for mine which was sent to me by an ALR member, but I haven't tried it as yet. Maybe one of these days. The fairly deep, narrow grooves might not like it much. For now, I can't see a need for the bullet as round balls seem to work well to the 75 yard gongs, even managed the 100yard bunny-in-the-hole - once. My tendency is to shoot beside it's head, holding too much front sight. When I aimed at it's head, I managed a hit in the body. There is only about 4" of drop from a 50 yard zero, when using 35gr. 3F and the .311" ball. With the .0215 or .0225 patch, once seated flush- one ight smack with the starter, it's 2 finger loading to the powder- all day, no wiping using water based, spit or an oil for lube.
The .320 buckshot I have is of the hardened variety, so I've resisted the urg to try it. It might be OK, but I doubt it, with the narrow grooves.