DCHP-1 Online
muzzle-loading bunk Slang 
a kind of bunk placed in banks at right angles to the wall so that the user must crawl in head first and out feet first (as in charging a muzzle-loading gun).
See also: cannon bunk muzzle-loader shotgun bunk
- 1947 When he went to bed in the "muzzle-loading" bunks that lined the walls of the shanty, he stuck his knife in a niche of the wall at his head.
- 1959 Times have changed mightily since those days of the bucksaw, the horse, the log bunkhouse, and the "muzzle-loading" bunks in which men slept side by side under a long "canvas" made of wool army blankets sewn together.
- 1947 When he went to bed in the "muzzle-loading" bunks that lined the walls of the shanty, he stuck his knife in a niche of the wall at his head.