The Forster CO-AX Case and Cartridge Inspector is a concentricity gage which is unique in that it will check bullet runout and case neck runout in relation to the centerline axis of the cartridge case. This gage will measure neck wall thickness, bullet runout to .001 inch accuracy. Forster standard trimmer pilots are required for case neck wall thickness measurements (will not work for .17 caliber), but are not used for neck wall or bullet runout measurements. Maximum cartridge length for bullet runout measurement is 3.5 inch.
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Sinclair, Issue:3B, Page:036