The Hornady Lock-N-Load Headspace Kit with Body (Hornady part no. HK66) gives handloaders a way to measure case headspace and bullet seating depth consistently from the shoulder, not the case mouth. Hornady built this kit to cover chamberings from .17 Remington through belted magnum cartridges, letting handloaders track exactly how much a case has grown after firing or resizing.

Key Specifications

• Caliber coverage from .17 Remington through belted magnum cartridges spans most rifle chamberings a handloader will run.
• Headspace comparator body included provides the base unit needed to take shoulder-referenced measurements.
• Shoulder-referenced measurement gives a more consistent readout than measuring from the case mouth.
• Consistent case tracking helps handloaders monitor case growth after firing or resizing.
• Helps catch dangerous case-head separation risk early by flagging excess headspace growth before it becomes a safety issue.

Frequently Asked Questions

What does this kit measure? It measures case headspace, referenced from the case shoulder rather than the case mouth, for a more consistent readout.

What calibers does this kit cover? It covers chamberings from .17 Remington through belted magnum cartridges.

Why measure from the shoulder instead of the case mouth? Shoulder-referenced measurement gives a more consistent, repeatable readout since the case mouth can vary more than the shoulder position.

Buy the Hornady Lock-N-Load Headspace Kit with Body

Track case growth with confidence. Order the reloading equipment from our Lubbock, Texas gun shop and add shoulder-referenced measurement to the bench.