RCBS MatchMaster Case Trimmer Collet #2 .418/.506

Number two is the collet for .350, .418 and .506 diameter cases on the RCBS MatchMaster trimmer, a group that includes 30-30 Winchester and 7.5x55 Swiss along with other cartridges sharing those dimensions.

Sizing the collet to the case is not optional on a trimmer this precise. Run one that is too large and the case can move under the cutter; matched correctly, it locks the brass square to the cutting path so trim length repeats across a whole batch of prepped cases. Keep the right ones on hand if you load several case families and swap between them at the bench.