L.E. Wilson 50 BMG Case Gage (CG-50BMG) Headspace & Length Tool

Description

If you reload .50 BMG, you already know the brass is too expensive and the pressures too serious to guess at your sizing. The L.E. Wilson 50 BMG Case Gage takes the guesswork out of the equation. It's a one-piece, oversized gage machined to SAAMI chamber dimensions, built to check the two things that matter most when you're prepping big fifty brass: datum-to-head length for headspace and overall case length for trimming.

Using it is about as straightforward as reloading tools get. Drop a fired case into the gage, measure where it sits, then slowly dial in your full-length sizer until you get that small 0.001 to 0.002 drop in headspace. That gives you a case sized just under your chamber's headspace, which means better accuracy and brass that lasts because you're not pushing the shoulder back any further than needed. Once the case is sized, stand the gage head-down on a flat surface and sight across the top to read your min and max trim length.

Why the 50 BMG Case Gage Earns a Spot on the Bench

The real value here is seeing exactly how far your shoulder moves during resizing. Oversize .50 caliber brass and you're inviting case separation, which is the exact problem Sam Wilson set out to solve when he designed the original Cartridge Case Gage back in 1935. Nearly a century later, the design still does its job without batteries, settings, or fuss.

Getting the Most Out of Your 50 BMG Gage

This is a non-adjustable gage, so it reads against SAAMI spec rather than a specific rifle. For precise numbers, pair it with a depth micrometer or a set of calipers depending on whether the case sits high or low in the gage. The caliber is laser engraved right on the body so there's no mixing it up on a loaded bench, and like the rest of the Wilson line it's made in the USA. One thing worth knowing: it checks length and headspace, not body diameter, so it's meant for use with fired cases as your baseline for sizing and trimming.