Forster No Go Gauge Belted Magnum, 300 Winchester Magnum, 7mm Remington Magnum, 338 Winchester Magnum, 458 Winchester Magnum (.535" Base)

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