The Sinclair Bullet Comparator Inserts are designed for use with the Sinclair Comparator and Bump Gage Body to accurately measure bullet ogive-to-base and loaded round measurements.
These inserts are crafted from stainless steel with a taper and a short straight section to replicate the chamber throat more precisely, reducing wobble and increasing consistency.
They provide a more reliable measurement than overall length by focusing on the ogive, which is less variable than the meplat (bullet tip).