Forster Headspace Gauge Field Length 257 Roberts, 7x57mm Mauser (7mm Mauser)

Forster Products manufactures precision headspace gauges to maximize safety and accuracy in your rifle. These gauges are necessary when finish chambering a barrel, or when checking the chamber of a used gun to be sure the headspace dimensions are within safe limits. Machined from A2 tool steel, these gauges are held to tolerances within 0.00015" to ensure accurate testing of your rifle's chamber.Notes:Headspace standards are set by SAAMI (Sporting Arms and Ammunition Manufacturers Institute) spe