The Sinclair International 338 Lapua Bump Gage Insert is a caliber-specific insert used with Sinclair bump gage components to help verify and set headspace/bolt thrust conditions consistently during reloading and chamber checking.
Key Features
Caliber-specific 338 Lapua insert for a precise fit with Sinclair bump gage systems
Hardened steel construction for durability and repeatable measurements
Helps you confirm the amount of case movement/bolt thrust more consistently during setup
If you’re dialing in your 338 Lapua setup, this insert is an easy way to keep your bump gage measurements consistent.
