I have a stash of several hundred virgin IMI 30-06 cases which are seperated into lots of 80-100; all weighing within 1.0 grains. I fireformed the first, lightest lot and have started using them to find "the load" for my Sporterized m-1917, only to find that they are not fully fireformed, as evidenced by slightly backed-out primers after firing.
Should I just keep shooting them while working up match-type CB loads, or load up j-bullets full-power? I really do not look foreward to another lengthy de-coppering as I had to do when I first got the rifle.
Also, any fireforming load suggestions appreciated.