Sinclair Shoulder Bump Gauge Insert #28 28°

This Sinclair International shoulder bump gauge insert is machined with a 28-degree angle for measuring the shoulder position of 22-250, 223, and 243 cartridge cases. The insert works as part of a shoulder bump gauge system, letting reloaders check where a case shoulder sits before and after sizing.

Consistent shoulder measurement helps ensure cartridges chamber uniformly and supports repeatable accuracy when loading for rifles in these calibers.

Key Features

How to use

Install the insert into a compatible shoulder bump gauge, then use it to measure the shoulder position of 22-250, 223, or 243 cases before and after sizing.