Sinclair - Comparator Insert Size:17 cal resulting in perfectly concentric case

resulting in perfectly concentric case necks

This also makes it far safer for use with black powder

and feature two separate side clamps

On the other hand

Sinclair - Comparator Insert Size:17 cal resulting in perfectly concentric caseThe Sinclair Bullet Comparator inserts are meant to be used with the Sinclair Bullet Comparator and Bump Gage Body. These inserts are stainless steel and machined with a taper and a short straight section to more accurately duplicate the chamber throat. This eliminates the wobble experienced with many comparators which have standard drilled holes. Our design allows you to quickly and accurately measure and compare bullet ogive to base as well as