资料来源 : Webster's Revised Unabridged Dictionary (1913)

Muzzle-loading \Muz"zle-load`ing\, a.
   Receiving its charge through the muzzle; as, a muzzle-loading
   rifle.

资料来源 : WordNet®

muzzle-loading
     adj : (of firearms) taking the projectile or cartridge through the
           muzzle