My situation is exactly the opposite of yours. I have used 4064 for years in 308 for both bolt and AR10 but I can't get it. So now I am having to go to Varget. 4064 is indeed a standby for 308 and you will not have any trouble, Many theorize that 4064 is used by Federal in their Gold medal match ammo. Others say it is a revised non commercial version. But I know it looks just like it. 43.7g behind a 168g pill works for me. I just wish I could get some more to resume loading again.
I think in the AR10 I back off slightly to 42.5g in Lapua or Hornady match brass
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