The Wilson Case Length Gage .357 Magnum (L.E. Wilson part no. CLG-357M) is a one-piece, non-adjustable cylinder-type gage that checks the minimum and maximum overall case length on straight-wall pistol brass with no shoulder. Made in the U.S.A. by L.E. Wilson, it’s used by sliding the gage over the top of a case set on a flat surface, with the grooves facing up, then running a straight edge over the top to read case length against the milled reference surfaces. This gage measures case length only — it does not check body diameter, so a separate Pistol Max Gage or Min Dimension Gage is needed for diameter checks. It’s a simple, durable way for .357 Magnum handloaders to catch out-of-spec brass before it goes back into a die.

Key Specifications

• Chambered for .357 Magnum straight-wall cases.
• Design is a one-piece, non-adjustable cylinder-type gage.
• Checks minimum and maximum case length only, not body diameter.
• Made in the U.S.A.
• Milled reference surfaces are used with a straight edge to read length.

Frequently Asked Questions

Does this gage check case diameter too?
No — it measures case length only; body diameter requires a separate Pistol Max Gage or Min Dimension Gage.

How is the gage used?
Set the case on a flat surface, slide the gage over the top with the grooves up, then run a straight edge across the top to check length.

Buy the Wilson Case Length Gage .357 Magnum

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