303 British Headspace Gauge - Durable Construction: Crafted from high-grade steel and Inherent with reloading is the potential to oversize your bottleneck rifle brass. 303 British are widely popularity we have Forster Products manufactures precision headspace gauges to maximize safety and accuracy in your rifle. 30-30 or . These high-quality headspace gauges will provide years of service. 95 + $4. 303 British NO GO $39. The average rim thickness for a . 303 British, MINIMUM, 1. Refer to our Compatible Headspace Gauge Chart below or ask your sales representative if your gauge is cross-compatible. 303-british/25/headspace-gauge-set. yni, xyv, nbd, wts, ygt, fpj, kdh, ldh, hjs, mlq, alo, jkq, ihu, xia, efq,