The old factory 10" bull barrels had a 1-10" twist. I recently bought one of the "Super 14" barrels from Midway. They are advertised as 1-12" twist. I bought it to use in IHMSA Unlimited Standing category. I am loading Hornady 150 SP with 13 Gr. of 296. Accuracy is very good. I also had a muzzle brake installed, which made it a really pleasant gun to shoot. One note about MY Midway barrel. It has a very SHORT throat - I had to seat the bullets much deeper in the case than the previous 2 30 Carbine barrels that I have owned (a factory 10" Bull and a 12" TC Custom shop)
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