I've owned a number of them in doubles and drillings. You would do well to do a look over on AccurateReloading.com. it is not a BP cartridge, although there are a couple BP precursors. It is a good heavy hitter for game. Brass, bullets and load data are readily available. It is more of a parent case. Get out the Google machine, and crank the handle, lots of info out there.
Bfly

Be nice and work hard, you never have enough time or friends.