The Hornady Lock-N-Load Headspace Gauge is perfect for measuring from the case-head to the datum line on the case shoulder to allow proper brass resizing for a precise fit with the rifle chamber. Bushing fit the comparator body and attach to calipers with a thumb screw. Can be used with bottleneck cases from 17 caliber through large belted magnums.

Fits: 17 Hornet
Notes:

• This is for the bushing only, the Bullet Comparator and Calipers that are required for the set to work are (Sold Separately)
• All bushings are interchangeable with the Comparator