The Sinclair Bullet Comparator Inserts are designed to fit the Sinclair Bullet Comparator and Bump Gage Body, providing precise measurements.
Made from stainless steel, these inserts are machined with a taper and short straight section to accurately replicate the chamber throat, reducing wobble.
They allow for consistent measurement of bullet ogive-to-base and loaded round ogive-to-cartridge-base, which is more reliable than measuring overall length due to meplat variability.