The big ol' .454 was my first consideration when I was literally agonizing over which caliber of cartridge revolver to get. I finally went with the .357 Mag in the Vaquero platform. Big enough for game and defense against woodland predators, and yet equally efficient and compact enough for carrying around in civilization. Now, the .454 Casull is the parent of another new chambering, called the '.454 BPM', or 'Black Powder Magnum', by hunters who rely on cap and ball revolvers... Just fill a .454 case with BP or BP substitute with just enough room to seat a projectile and crimp... 50-55 grains should easily fit in there and packs a HUGE wallop when fired from a cartridge converted Walker/Dragoon, and since black powder combustion pressures are low even with such souped up loads, they can safely be used in these revolvers without the dangers of loosening up something.