I have a little winter project going, I'm swaging 20 ga Foster style slugs without the rifling fins. I made a die for my swage press to form the slugs. They are about 7/8 oz. I use a LEE .600 round ball mould to make my swage cores. I have some Cheddite hulls, fiber wads, plastic over the powder seal, and nitro cards still waiting to be delivered. I'll roll crimp them. I've already tested some proto-types with Win AA hulls with a folded crimp and results were very promising. If you remember I bought a rifled slug barrel for my Browning BPS pump shotgun and the 2 3/4 inch Winchester factory slugs shot into 3/4 to 1 inch groups at 100 yards. Here are some pictures of my swaged slug.