Shoulder Bump Gauge

Select the gauge that matches your cartridge’s published shoulder angle. If you are using a custom chamber, improved cartridge, or wildcat, verify the chamber print before ordering.

17.5 Degree Shoulder Gauge
Classic Springfield-family and long-action hunting cartridges with a 17.5 degree shoulder.
Common examples: .30-06 Springfield, .25-06 Remington, .270 Winchester, .280 Remington, .35 Whelen.

20 Degree Shoulder Gauge
.308 Winchester-family and related short-action cartridges with a 20 degree shoulder.
Common examples: .308 Winchester, .243 Winchester, 7mm-08 Remington, .260 Remington, .338 Federal.

23 Degree Shoulder Gauge
.223 / 5.56-family cartridges and related small-frame rifle cartridges with a 23 degree shoulder.
Common examples: .223 Remington, 5.56 NATO, .300 Blackout.

25 Degree Shoulder Gauge
Common belted magnum hunting cartridges with a 25 degree shoulder.
Common examples: 7mm Remington Magnum, .300 Winchester Magnum.

28 Degree Shoulder Gauge
Varmint and medium-capacity cartridges using a 28 degree shoulder.
Common example: .22-250 Remington.

30 Degree Shoulder Gauge
Creedmoor, BR, and select magnum families using a 30 degree shoulder.
Common examples: 6.5 Creedmoor, 6mm Creedmoor, 6mm BR, Remington Ultra Magnum family.

35 Degree Shoulder Gauge
Modern hunting and short-magnum cartridges using a 35 degree shoulder.
Common example: 6.8 Western. Also verify other modern short-magnum cartridges by published shoulder angle before selecting this gauge.

40 Degree Shoulder Gauge
Steep-shoulder improved, competition, and custom cartridges using a 40 degree shoulder.
Common examples: 6 Dasher, 6BRA, and many improved or wildcat cartridges. Always verify the exact shoulder angle on custom chambers before ordering.