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The Hornady Lock-N-Load Headspace Gauge Set is an affordable tool for handloaders to measure headspace changes on their cartridges. It comes with different bushing sizes, depending on the cartridge family, which can be inserted into the Hornady Lock-N-Load Comparator Body, that attaches to a caliper. With this set, handloaders can measure the changes between fired and sized brass to adjust their sizing dies and ensure a proper fit in their chamber. Oversizing cases can cause excessive headspace problems, which shortens the life of the brass.

This set can measure brass from the case head to the datum line on the case shoulder. It comes with five bushing sizes that can measure the headspace on most bottleneck cartridges from 17 Remington through the belted magnums. The bushings can be bought with or without the Comparator Body, for those who already have one.

Check the Hornady Gauge Bushing Chart to find the correct size for your cartridge family.