Sinclair #40A 40° Bump Gauge Insert, (25 to 338 Calibre) 257 Roberts Ackley Imp., 280 Rem Ackley Imp. Cartridge_45 Auto Rim Doppler radar and decades of

Doppler radar and decades of bullet performance knowledge have developed an entirely new class of bullet

moly-fouled barrels

unprimed shortened case and then chambered into your rifle

878 Ballistic Coefficient G7

Sinclair #40A 40° Bump Gauge Insert, (25 to 338 Calibre) 257 Roberts Ackley Imp., 280 Rem Ackley Imp. Cartridge_45 Auto Rim Doppler radar and decades ofSinclair 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