Abstract: A method and device (A) for cutting a shotgun shell (14) for shooting in a shotgun chambered for shorter shotgun shells includes a base (10) and shell receiving tube (12). A shell (14) is held in tube (12) above a knife (32) in such a manner that a circumferential slit is formed in shell casing (20) around the inside edge (24) of crimp (22). The knife is carried on a movable knife blade holder (40) which moves toward base (10) to engage the knife in the crimped edge as the shell is rotated. Upon shooting of shell (14), the crimp material separates from casing (20) leaving the shell of a shorter length. In this manner a two and one half inch (21/2") shell is obtained from a two and three-quarter inch (23/4") and three inch (3") shells which may be reloaded or disposed of.