What they said --
Everything from 35 up to 69 should shoot fine if you have a good barrel. Good versatile twist. My old Savage barrel was (is -- it's getting a second life someday) really, really fond of 60 grainers over Varget. And a batch of pulled milsurp 62 grainers shot ridiculously well -- I have no idea what they were, only had a few of them, less than 100, but they just drilled.