Generally yes...you're right... but think about it...the faster the twist, the the more stress on the rifling near the throat, trying to get the bullet spinning...it seems to be popular opinion that 1 in 7 is harder on the first few inches of rifling...thats why you dont see any 1 in 9 barrels made from 4150 CMV steel, and nearly all 1 in 7 barrels are 4150 CMV.Truthfully twist wont matter for throat wear its loads FPS and how hot you let the barrel get and how fast you shoot that causes Chamber throat wear ..
Whats your favorite bbl. rifling twist rate with which favorite bullet wgt. in a .223 AR-15? Tracy