The book I have says that 48.4 gr of IMR 4895 emulates the old M2 round. Start at 46 gr and work your way up .5 gr at a time. I would not exceed the 48.4. if you load too hot you can bend the op rod. bending the op rod is considered bad Ju-JU. as you likely know it's already bent but that bend is critical.
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