A select number of 444 Black Shadow BB were offered with 1-12 twist. The goal was to stabilize the heaviest projectiles that could be thrown in the 444 with great accuracy. The 444 will push 355 gr cast gas checks at 2025 fps and 405 gr gas checks at 1750 fps. Not sure if the TC was issued with such a twist rate. My 444 BS is a 1-12” came with a card in the box describing features and the twist rate of the rifle.
