The Sinclair Bullet Comparator Inserts are designed for use with the Sinclair Comparator and Bump Gage Body to accurately measure bullet ogive-to-base and loaded round measurements.
These inserts are made of stainless steel with a tapered and straight section to replicate the chamber throat and reduce wobble for consistent results.
The inserts help provide more reliable measurements than overall length by accounting for variations in the bullet's meplat.