Tends tumbling barrels that impregnate shotgun-shell filler wads with wax to seal propellant charge against moisture and facilitate ejection of wad when shell is fired: Weighs and dumps specified quantity of wads and wax into steam-heated barrel.
Stops barrel at end of prescribed time and examines wads for color shade indicating sufficient impregnation. Weighs specified number of impregnated wads and compares with weight of equal number of dry wads, using chart, to confirm that correct amount of wax has been absorbed.
