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" 22PPC, 22/250 Rem, 6PPC, 6BR Rem, 250 Savage, 7BR Rem
C - .375" 6mm Rem, 257 Rob, 25/06 Rem, 270 Win, 7x57mm Mauser, 280 Rem,  30/30 Win, 30/06 Sprg, 300 H&H Mag, 7.62x39 Brit, 6.5x55 Mauser,  7mm WSM, 303 Brit, 30-40 Krag
D - .400" 223 WSSM, 243 Win, 243 WSSM, 260 Rem, 270 WSM, 7mm/08 Rem,  300 Savage, 308 Win, 35 Rem
E - .420" 6.5x284, 284 Win, 7mm Rem Mag, 7mm Ultra Mag, 300 WSM, 300 Wby Mag, 325 WSM, 338 Win Mag, 350 Rem Mag, 375 H&H Mag, 264 Win Mag,  7mm SAUM, 7mm STW, 300 RSAUM, 300 Win Mag, 300 Ultra Mag,  8mm Rem Mag, 338 Ultra Mag, 35 Whelen