Throat geometry for Berger 208 LRH, 215H, 220LRH, 230H, Hornady 208 ELDM, Sierra 195TMK, 220MK, 210 MK bullets. Some of these bullets will only be seated ~60% into the neck when bullet is touching lands. All will be seated some distance forward of the cartridge neck/shoulder junction when touching. (per published bullet dimensions).

Throat length can be ground to suit other bullets or desired seating depths

SAAMI minimum chamber body, with neck diameter reduced from SAAMI .346/.345

Uses standard 300 WSM Headspace gauges. Uses standard 300 WSM Roughing reamer.