Jevaughn
Master
I've been looking at building an AR-platform PCC and stumbled across some threads about the rimless .357. Use either necked up 5.56 cases or Starline makes a virgin 5.56 case that hasn't been necked down and has a blank head-stamp, all you gotta do is trim to length. Has anyone here ever experimented with such? I've got plenty of stuff for reloading .357 (dies, projectiles of various types, even some of those illusive primers) and was wondering if anyone here has experience and if so, what that experience was? With the .357 rimless, it's the same load data for .357 magnum, only difference is the case. Granted, the brass might vary some charges based on case capacity, but should be pretty close.