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Manufacturer: Hornady HK66
Headspace Set Kit (Includes Comparator Body and Five Bushings)
The Head 'n Shoulders gauge is the best method to extend brass life, improve accuracy, and enhance safety. The gauge measures variations in your brass before and after firing, or re-sizing. It allows comparison between fire-formed brass and your re-sized brass. Any of five interchangeable bushings (included) are attached to your caliper using the same B-2000 body (included) as found on our Bullet Comparator.
After attaching to your caliper with the brass thumbscrew, simply select the proper bushing (see chart below) to measure your cases from the case-head to the datum line on the case shoulder. Typically, when full-length re-sizing, the die should be adjusted to set the shoulder back .001" to .002". This will provide a proper (minimal) clearance with the firearm's chamber. A proper headspace will minimize case stretching, reduce work hardening, extend case life, improve accuracy, and increase safety.
For the shooter with an autoloader, check your fired cases by rotating the brass in the Head 'n Shoulders Gauge to identify cases with bent rims - a certain cause of "flyers". You can also identify excessive headspace conditions, which is a potentially dangerous situation. Proper headspace also provides proper firing pin contact with the primer to improve the reliability of your loads.
Bushing Size Chart:
A .330" - .17 Rem, .222 Rem, .222 Rem Mag, .223 Rem, .220 Swift, .221 Rem FB,
B .350" - 22 PPC, 22/250 Rem, 6 PPC, 6 BR Rem, 250 SAV, 7 BR Rem, 7x30 Waters, 22 BR Rem
C .375" - 6mm Rem, 257 ROB, 25/06 Rem, 270 WIN, 7x57mm MAUSER, 280 Rem, 30/30 WIN, 30/06 SPFLD, 7.62x39 RUSSIAN, 303 BRIT, 300 H&H MAG, 30-40 KRAG, 22 CHEETAH
D .400" - 243 WIN, 7mm/08 Rem, 308 WIN, 7mm STE
E .420" - 284 WIN, 7mm Rem MAG, 300 WIN MAG, 8mm Rem MAG, 338 WIN MAG, 375 H&H, 7mm STW