Hornady Lock-N-Load Headspace Comparator Kit with Body and 5 Bushings, HK66

Hornady HK66 Lock-N-Load Headspace Kit w/ Body .17 Rem Through Belted Magnums Rifle Firearm Includes Body with 5 Bushing Set

The Hornady Lock-N-Load Headspace Comparator Kit, part number HK66, helps reloaders measure headspace variations in bottleneck cartridge cases before and after firing or resizing. By comparing fire-formed brass with resized brass, this reloading accessory supports more consistent case preparation, improved accuracy, and longer brass life. It also promotes safer reloading practices by helping users monitor how brass fits the chamber and how resizing adjustments affect case dimensions.
The kit includes the Lock-N-Load Headspace Comparator body and five interchangeable bushings designed to accommodate a broad range of bottleneck cases, from .17 Remington through belted magnum cartridges. This coverage makes the comparator useful for many rifle reloading applications, whether you are evaluating newly fired brass, checking resized cases, or refining die setup for a specific chamber. Ackley Improved chambers use the same bushing size as the parent cartridge, simplifying bushing selection for compatible cartridges.
Use the included cartridge and bushing reference chart or consult the product instructions for detailed sizing information. The Hornady HK66 provides a practical way to compare case-to-chamber relationships and maintain repeatable results during the reloading process. Its focused design makes it a valuable addition to a reloading bench for shooters who want greater control over brass preparation and cartridge consistency.

Features:

• Caliber: Compatible with .17 Remington through belted magnum bottleneck cases

• Function: Measures headspace variations before and after firing or resizing

• Includes: Lock-N-Load comparator body with five interchangeable bushings

• Compatibility: Ackley Improved chambers use the same bushing size as the parent case

• Type: Reloading accessory for brass preparation, die setup, and cartridge comparison