Forster 6.5x55mm Swedish SAAMI Dimensioned No-Go Length Rimless Headspace Gauge

Every gunsmith understands that the correct application of a headspace gauge is the most dependable method for assessing the length of a rifle chamber. "headspace" refers to the distance between the breech face and the base of the cartridge when the action is closed. Excessive headspace can pose safety risks and compromise accuracy. For example, unsupported brass fired in a rifle action with excessive headspace may rupture, causing gas to escape rearward in a manner similar to rocket exhaust. If