BPCR, for those uninitiated, is "Black Powder Cartridge Rifle"; those quasi-modern pieces from the latter 19th Century that use metallic cartridges but still use good old fashioned black powder instead of modern smokeless for a propellant. I've got a few now, and I'm hoping for more (a Rolling-Block Remington or a Trapdoor Springfield would be oh so cool.) Reloading for these is borderline mandatory, though. It's not like you can't get commercially-loaded ammo, it's just that:
1) .43 Mauser (11mm Mauser): $53.00/20
2) 11x59R Gras: $68.00/20
3) .577-450 Martini-Henry: $105.00/20
So, yeah. Yikes. And you thought your .300 Win Mag was 'spensive to shoot...