Lock-N-Load® Headspace Comparator provide the ability to check most bottleneck cases, from .17 Rem through belted magnums. Ackley Improved chambers use the same bushing size as the parent case. See chart provided or consult product instructions for cartridge/bushing size details.
A .330″ #A330
– 17 Remington
– 204 Ruger
– 221 Remington Fireball
– 222 Remington
– 222 Remington Magnum
– 223 Remington
– 220 Swift
B .350″ #B350
– 22 PPC
– 22-250 Remington
– 6mm PPC
– 6mm Bench Rest Remington
– 250-3000 Savage
– 7mm Bench Rest Remington
– 300 Blackout
– 6.5 Grendel
C .375″ #C375
– 6mm Remington
– 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″ #D400
– 223 Winchester Super Short Magnum
– 243 Winchester
– 243 Winchester Super Short Magnum
– 260 Remington
– 270 Winchester Short Magnum
– 7mm-08 Remington
– 300 Savage
– 308 Winchester
– 35 Remington
E .420″ #E420
– 6.5mm-284
– 284 Winchester
– 7mm Remington Magnum
– 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
– 8mm Remington Magnum
– 338 Remington Ultra Magnum
– 35 Whelen
