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Patrick; been there, done that. I was working up reloads for my M1 Carbine, and after shooting the hottest of the loads, which were 0.1gr. different, and under the max published in one loading book, I pierced the primers on the next lot of 10 rds. I didn't discover this until I was through shooting.
Be careful, and watch pressure carefully. Also, I would not use mag primers, as the small case volume, IMHO, makes them superfluous. If you do use mag primers, start with low loads and work your way up. Very carefully. Hope this helps, Walt
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