Hornady .250 bushing/caliber insert for match grade reloading die

Hornady .250 Bushing/Calibration insert for Match Grade reloading die
Calibration insert for Match Grade full-length or neck sizing die. Made of hardened steel (identical to Redding and RCBS). Procedure for selecting the appropriate insert: Measure the neck diameter of a finished loaded cartridge and subtract 0.002"-0.003" from that measurement (thickness of the case material). This should then yield a measurement with which one can find a suitable bushing.