The Sinclair Bullet Comparator Inserts are designed for use with the Sinclair Comparator and Bump Gage Body to measure bullet ogive-to-base and loaded round ogive-to-cartridge-base.
Made from stainless steel, these inserts have a tapered and short straight section to more accurately replicate the chamber throat and reduce wobble.
They provide a more consistent measurement than overall length due to variations in bullet meplat, leading to more precise reloading and shooting accuracy.