Sinclair #40A 40° Bump Gauge Insert, (25 to 338 Calibre) 257 Roberts Ackley Imp., 280 Rem Ackley Imp. Cartridge_45 Auto Rim moly-fouled barrels

moly-fouled barrels

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Sinclair #40A 40° Bump Gauge Insert, (25 to 338 Calibre) 257 Roberts Ackley Imp., 280 Rem Ackley Imp. Cartridge_45 Auto Rim moly-fouled barrelsSinclair Bump Gage Inserts are used to measure the amount of shoulder bump when setting up full length sizing dies. These Bump Gauges install in either of the Sinclair or Hornady comparator bodies and are machined to fit particular shoulder angles of cartridges. Rather than measuring to the datum line, these gauges indicate off of the shoulder of the case to get a better, more easily assessable measurement of how much you are actually sizing your