Lyman Case Length Headspace Gauge - .300 Winchester Short Magnum

The Lyman Case Length Headspace Gauge for the .300 Winchester Short Magnum is a precision reloading tool engineered to verify both case length and headspace on bottleneck rifle cases. Simply insert each resized case into the gauge to confirm it falls within SAAMI-spec length and headspace tolerances before it is loaded.

Machined from durable metal and sized specifically for the .300 WSM, this compact gauge measures 1.35 x 2.80 x 5.65 in and helps reloaders achieve the highest levels of accuracy and shooting safety by flagging out-of-spec brass before it ever reaches the press. Engineered for both hobbyist and professional reloaders, it is ideal for sorting trimmed brass, identifying cases stretched beyond safe limits, and confirming headspace dimensions on new or once-fired brass before working them up into accurate handloads.