LMLGC: Preserving History, Comradery and the Constitution
What is a Muzzleloader?
In short, a muzzleloader is any firearm that you load from the end of the barrel where the projectile exits, which is called the muzzle. It could be a rifle, a shotgun, or a pistol or a revolver.
Source: Muzzle Loading Basics from Pew Pew Tactical