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Vladimir, twist rate is 1:10" RH. All specs here >>> https://www.ruger.com/products/americanRifleHunter/specSheets/26993.html .....Have a great day!

This has a 20" Threaded Heavy Contour Barrel, with a 1;10 twist ratio. Hope this helps.

vladimir, this rifle has a Heavy-contour (.850" at the muzzle) barrel with a 1:10" RH Twist rate and Thread Pattern of 5/8"-24. Cheers and stay safe!

1:10 twist rate