MEC 600 Jr 410 Bore Shotshell Die Set - Pre Mark 5

The MEC 600 Jr 410 Bore shotshell reloading die set converts your MEC 600 Jr shotshell reloader to load 410 Bore shotgun shells. Machined from high tensile steel, this single-cavity die set delivers precise resizing, depriming, and roll crimping for 410 Bore shotshells on the 600 Jr press platform.

This Pre Mark 5 configuration is the correct die set for 600 Jr presses produced before the Mark V tooling update, specifically units manufactured prior to 1982 and from 1982 through 1985. It is not compatible with the current 600 Jr Mark V press, which uses the updated Mark V die set.

The set includes a size pilot die with roll crimper, a shell holder die with roll crimper, a K.O. bushing, a resize ring, and a deprime punch, everything needed to switch your press over to 410 Bore. Whether you are loading light target shells, plinking rounds, or hunting-grade 410 Bore shotshells, this MEC die set provides the consistent sizing and crimping performance the 600 Jr platform is known for.