Sinclair Bullet Comparator Insert 338 Calibre (0.338") Stainless Steel Rod Guide cartridge_270 Weatherby Magnum 5mm (from the center-line of

5mm (from the center-line of the ring to bottom of Optilock base)

The Super Squeaker won't freeze up and includes a sound chamber for added volume and allows for an array of different tones

Not compatible with the Sinclair "Sharkfin" or the L

Scandinavian hunting and traditional rifle competitions

Sinclair Bullet Comparator Insert 338 Calibre (0.338") Stainless Steel Rod Guide cartridge_270 Weatherby Magnum 5mm (from the center-line ofThe Sinclair Bullet Comparator inserts are meant to be used with the Sinclair Bullet Comparator and Bump Gauge Body or Hornady Comparator 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. This design allows you to quickly and accurately measure and compare bullet