Designed for 16 gauge shotshells, it includes a 1oz. Model: 600 Jr Mark V. Gauge: 16 Gauge. Includes 1 oz. Cam-Action Crimp Die for Factory-Like Shell Finish. Shell Length Compatibility: Adjustable up to 3".
MEC is the most user friendly , cost effective way to reload plastic shotgun shells. I have several of the from 600 jr.mark 5 to 9000G in gauges from 28ga to 10ga.