Designed for use in the Lock-N-Load Headspace Gauge, these bushings are machined to exacting tolerances to ensure reliable results every time you use them. The Lock-N-Load Headspace Comparator extends brass life, improves accuracy, and enhances safety. The gauge measures variations in brass before and after firing or re-sizing. It allows for headspace comparison between fire-formed brass and re-sized brass.

A comparator body is required.

Determining the proper bushing diameter: If you add the neck diameter and the shoulder diameter and divide that number by two, use the bushing closest to that number.

Hornady Headspace Bushing Size Chart:

A - .330" .17 Rem, 204 Ruger, 221 Rem FB, 222 Rem, 222 Rem Mag,  223 Rem, 220 Swift
B - .350" 22 PPC, 22‑250 Remington, 6mm PPC, 6mm Bench Rest Remington, 250‑3000 Savage, 7mm BR Rem, 300 Blackout, 6.5 Grendel, 6mm ARC
C - .375" 6mm GT, 257 Roberts, 25‑06 Remington, 270 Winchester, 7 X 57mm Mauser, 280 Remington, 30‑30 Winchester, 30‑06 Springfield, 300 H & H Magnum, 7.62 X 39mm, M43 6.5 X 55mm Swedish, 7mm Winchester Short Magnum, 30‑40 Krag, 6.5 Creedmoor, 6.5mm X 47 Lapua
D - .400" 223 WSSM, 243 Win, 243 WSSM, 260 Rem, 270 WSM, 7mm/08 Rem,  300 Savage, 308 Win, 35 Rem
E - .420" 6.5mm‑284, 6.5 PRC, 284 Winchester, 7mm Remington Magnum, 7mm PRC, 7mm Remington Ultra Magnum, 300 Winchester Short Magnum, 300 Weatherby Magnum, 325 Winchester Short Magnum, 338 Winchester Magnum, 350 Remington Magnum, 375 H & H Magnum, 264 Winchester Magnum, 7mm Remington Short Action Ultra Magnum, 7mm Shooting Times Westerner, 300 Remington Short Action Ultra Magnum, 300 Winchester Magnum, 300 Remington Ultra Magnum, 300 PRC MATCH, 8mm Remington Magnum, 338 Remington Ultra Magnum, 35 Whelen