Lyman Case Length Headspace Gauge 40 S&W

The Lyman Case Length Headspace Gauge in 40 S&W is a precision-machined reloading accessory used to verify case length, diameter, and overall cartridge length before assembling ammunition. Top reloaders consider this inspection step mandatory, since cases with excessive headspace should be discarded for safety reasons.

This compact gauge is machined from durable metal with a gray finish and accepts small-pistol 40 S&W cases with a .400" cartridge diameter. Measuring roughly 4.35" long by 2.50" wide by 1.45" tall, it fits easily on any reloading bench and lets you quickly confirm your brass meets SAAMI specs before resizing.

Used as part of a standard case-length check, the Lyman 40 S&W gauge helps ensure consistent chambering and reliable function in your handloaded pistol ammunition.