only if it's a .22lr, a Star pistol, or a cap and ball revolver. You can make your own snap caps. size the fired case, expand the mouth, seat and taper crimp the bullet, on a deprimed case, no powder. in place of the primer, put a trimmed to size hunk of pencil eraser, held in the case's primer pocket with rubber cement. the eraser "cushions" the firing pin strike quite nicely.