I'll be using a cast 320gr. out of my .454 Casull this year at around 1300-1400 fps, according to the book, with a 7.5 barrel on a revolver it's supposed to go 1275, but I'm shooting a closed-breech 12" Encore, so I think I should be getting a bit more than the 1275. I shot a turkey with it earlier this fall at a friend's farm place, shot it at the body-neck junction with a 255 cast at about 900-1000 fps, just a round hole, no meat damage, I didn't even cut it out when we cooked it! I think I'll like the cast, I've shot all my other deer with bows or a .30-06 or .308 or .243, and they don't mess up a lot, but I hope this does less.
Selmer