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One way to ascertain the rate of twist, if you don't know, is attach a brass brush to your cleaning rod, mark the cleaning rod with a thin line, pencil a reference point on the barrel muzzle, as you pull it out, once the mark on your cleaning rod has made one revolution, then measure the distance the rod has traveled. That's one way if you can't find out through the manufacturer. Darrell
 

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Sierra .224 dia. 69 gr. HPBT MatchKing, who knows about the powder, but most high power shoots (NRA) use 4895, 332, RE-15, and Varget, standard Winchester primers (free floating pin in AR's).GRUBBY
 
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