The Sinclair Bullet Comparator inserts are designed for use with the Sinclair Comparator and Bump Gage Body, enhancing measurement accuracy by reducing wobble.
These inserts are made from stainless steel with a tapered and short straight section to better replicate the chamber throat for precise bullet ogive-to-base measurements.
Measuring with these inserts provides more consistent results than overall length methods, as it accounts for variation in the bullet meplat.