Lyman Case Length Headspace Gauge 7.62x39mm

The Lyman Rifle Case Length Headspace Gauge for 7.62x39mm (brand part no. 7990394) is a precision inspection tool from Lyman used to check case headspace after resizing bottleneck rifle brass. Lyman recommends inspecting every bottleneck case after resizing to confirm the proper headspace dimension is maintained, since excessive headspace is a real safety concern. The reloader simply inserts a resized case into the gauge; if the case slides past the gauge’s maximum step, its headspace exceeds the safe limit and the case should be destroyed immediately rather than reloaded.

Key Specifications

• Sized specifically for 7.62x39mm bottleneck brass.
• Checks that resized cases have not exceeded the maximum safe headspace dimension.
• A simple insert-and-check design requires no measuring or calculation by the reloader.
• Lyman recommends destroying any case that fails the gauge check rather than reloading it.
• Weighs approximately 0.23 lb, small enough to carry in a range bag or tool box.

Frequently Asked Questions

How does this gauge work? Insert a resized case into the gauge; if it exceeds the maximum step, the case has excessive headspace.

What should I do with a case that fails? Lyman recommends destroying it immediately rather than attempting to reload it.

Why does headspace matter? Excessive headspace on a resized case is a genuine safety concern that this gauge is built to catch before the case is reloaded.

Buy the Lyman Case Length Headspace Gauge 7.62x39mm

Add the Lyman Headspace Gauge for 7.62x39mm to your next order of case preparation equipment. Ships fast from our Lubbock, TX gun shop.