This question is not so much strictly a "blackpowder" question as it is a "muzzleloader" question, regardless of propellant. Which caliber muzzleloader would you get if only getting one, and getting it only to hunt whitetails during muzzleloader season within the game regs, most likely with smokeless or pyrodex? And exactly what diameter is a "saboted 50" bullet? If it's saboted, it must be smaller than .50, no? Seems that the .50 is much more popular, and available in more models, but I'd think you'd get better external and terminal ballistics from a .45.....