It is a very good powder for 308. It was recommended some years back for M1A competition rounds. I have two friends that use it that way to good results. Look it up on the Accurate web site load data page.
I have not started reloading for my .308 Win yet so I can't give you personal experience. According to my Accurate Reloaders Guide, AA-2520 was developed for the .308 Win and will work in the M1/M14 system.
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