The Sinclair Bullet Comparator Inserts are designed for use with the Sinclair Bullet Comparator and Bump Gage Body.
These inserts are made from stainless steel and feature a tapered and short straight section to replicate the chamber throat, reducing wobble.
They enable precise measurements of bullet ogive-to-base and loaded round ogive-to-cartridge-base, offering more consistency than overall length measurements.