The Sinclair Bullet Comparator Inserts are designed for use with the Sinclair Bullet Comparator and Bump Gage Body to accurately measure bullet and cartridge dimensions.
These inserts are made from stainless steel with a tapered and straight section to replicate the chamber throat, reducing wobble and increasing measurement consistency.
They facilitate more reliable measurements by focusing on the ogive-to-base length, which is less variable than overall length due to meplat differences.