Forster .22-250 Remington SAAMI Dimensioned Field Length Rimless Headspace Gauge

Using a headspace gauge is the most reliable method to measure 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 create safety risks and reduce accuracy. For example, firing unsupported brass in a rifle with too much headspace can cause the case to rupture, allowing gas to escape backward like rocket exhaust. Because safety is paramount, Forster headspace gauges are made with me