Forster Rimmed and Belted Headspace Gage GO length for 303 British

Forster Rimmed and Belted Headspace Gage GO length for 303 British. "Headspace" is the distance between the face of the breech and the base of the cartridge when the action is closed and excessive headspace can be dangerous as well as impair accuracy. For instance unsupported brass fired in a rifle action with excessive headspace can rupture allowing gas to blow rearward like a rocket exhaust. Because your safety is on the line Forster Headspace Gages are made with painstaking care and exacting