69 gr would keyhole as would 62gr MFJ ie M855 ball. I would stick to shorter 60 gr jacketed lead bullets. Best would be 50-55 gr projos. Try the 52gr BTHPs for a accurate load in a 1:12 bbl. I've got to stock up on those for my wifes 18" Green Mountian 1:14 AR.
Thanks, sort of thought that was the score but wanted second opinions. Gonna stick with the 52 grain Sierra MatchKing type with the 1 in 12 for now and add a switch barrel in 1 in nine for 600 yards. Thanks, Bill.
The 60 gr HP like the hornady say they will stabilze in a 1:12 twist. The 60/62/64 gr berger HP/V are made just for that perpuse. Its bullet length to diameter ratio not weight thu we discribe it that way ofton.
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