Mine is a 1:9.25 twist. It is a factory Savage, SS, Fluted, Varmint barrel that has been rechambered. Bought it from another member here who was getting a new barrel. This one had an 1800 round count when I got it, and IIRC its just a touch over 2200 rounds now. Still shoots 1/2 MOA. I have had the 58's up faster (not sure how fast exactly) but I have not seen any hint of bullets separating or exploding in flight.