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Hi Mark and welcome. Twist Rate is 1:7" RH and will stabilize 120 to 150gr no issue. Cheers and stay safe!

Hi Mark, the twist rate is 1:7 Most of the the industry seems to be moving to 1:7 for .300 Blackout 150 grain bullets will work fine with a 1:7 twist A 1:7 or 1:8 twist rate is optimal for 300 BLK. Stay safe & have a great day!