I like IMR 4350 in my 300 Win Mag behind Berger VLD's. I use only Norma Brass and get quite a few firings out of them. The key is to size your brass so it head spaces off the shoulder and not the belt. The difference in headspace between new Norma brass and once fired brass is .017 in my McMillan. I neck size until brass starts chambering hard then body size. Oversizing the brass is what typically leads to premature brass failure. I also anneal the brass after two firings.
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