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I was fairly certain all post 2004 guns were 1:9 twist. Ruger lists all Mini-14 currently produced as 1:9 RH twist on their web site. That being said my 581 series rifle really likes the Sierra Matchking 69gr HPBT bullets so I see no reason why yours shouldn't like a 70gr bullet. Mine doesn't particularly care for the bulk 55gr stuff either.
Stu
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