These .22 Rimfire dummy rounds are ideal for gun testing and shooter training. Not snap caps, but rather precisely dimensioned, functional dummies; A-Zoom training rounds are CNC machined from solid aluminum and hard anodized. A-Zoom .22 Rimfire dummies are widely used for Hunter education and teaching safe firearms handling. Gunsmiths rely on them, too! A-Zoom 22 long rifle action proving DUMMY rounds are designed to teach safe firearms handling. They are not snap caps. They may be worked through the actions of any 22 long rifle for function testing. Dry firing will deform the head and will limit their use to 4 or 5 hits.