I've got a Buckhorn, replaced the Staghorn I had for several years. Things to be aware of: if primers fall out of the breech plug, bend the little spring-primer retainer doohickey. It'll shoot well with about 90gr Pyro RS and a 240gr XTP bullet, or 240gr Cheapshot; that is what I used t kill all my deer this year, until I upgraded to a Marlin 336. Powerbelts shoot fine, though they're waaaay overpriced.

Consider it a short range <100 yard rifle. Where you hit the deer is vastly more important that what bullet you hit them with, or how much powder you're using. Lots of inline muzzleloading hype out there...