The Sinclair 6.5mm (.264") Bullet Comparator Inserts are designed to work with the Sinclair Bullet Comparator and Bump Gage Body for precise measurements.
These inserts are made from stainless steel and feature a tapered design that closely replicates the chamber throat, reducing wobble and increasing accuracy.
They enable consistent measurement of bullet ogive-to-base and loaded round ogive-to-cartridge-base, offering more reliable results than overall length measurements.