L.E. Wilson 357 SIG Case Gage – CG-357S Headspace & Length Gauge

Description

If you reload 357 SIG, a good case gage is one of those tools you reach for every session without thinking twice. The L.E. Wilson 357 SIG Case Gage is a one-piece, non-adjustable steel gage machined to minimum SAAMI chamber dimensions, so you can drop a fired or resized case in and immediately see where it stands on both headspace and overall length. It takes the guesswork out of die setup and helps you avoid the single most common reloading mistake: oversizing your brass.

How the 357 SIG Case Gage Earns Its Spot On Your Bench

The real value here is in setting up your 7/8-14 full length resizing die. Drop a fired case into the gage and measure the headspace with a caliper or depth micrometer, then slowly dial the sizer in until you see about a 0.001 to 0.002 inch drop. That bump sizes the case just below your chamber's headspace, which means tighter, more consistent ammo and brass that lasts longer because you're not overworking it every cycle. For a cartridge like 357 SIG that already runs at high pressure and has a reputation for being picky about case prep, that kind of control matters.

Checking Trim Length With the Wilson Case Gage

Brass grows after sizing, and this gage flags it fast. Once a case is sized, set it in the gage head-side down on a flat surface and sight across the top. The step machined into the gage shows you the minimum and maximum trim length, so you know at a glance whether a case needs to go to the trimmer. Keep in mind this is a length and headspace tool, not a body diameter gage, and it's meant to be used with fired cases as your baseline.

L.E. Wilson has been building precision reloading gear for over 80 years, and the original case gage concept dates all the way back to company founder Sam Wilson in 1935. These are simple, rugged tools with no moving parts to wear out, which is exactly why so many reloaders keep one on the bench for every caliber they load.