PTG No Go Gauge 8mm Remington Ultra Magnum Ackley Improved 40-Degree Shoulder

Overview

The PTG No Go Gauge is designed for 8mm Remington Ultra Magnum Ackley Improved with a 40-degree shoulder. This tool is essential when finish-chambering a barrel or inspecting a used firearm to verify that headspace dimensions remain within safe limits. The No Go gauge duplicates the maximum allowable distance from the case head or bolt face to the cartridge shoulder datum line permitted within a safe chamber. If a firearm closes on this gauge, it indicates the chamber may exceed acceptable maximum dimensions and requires examination by a qualified gunsmith. Note that both Go and No Go gauges are required for complete and proper headspacing.

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