1 in 12\" twist in 300 Ultramag I purchased a 1999 Montana barreled action off Gunbroker in 300UM and bedded it in Accurate Innovations stock. After working up my best loads with the 200 AB (RL-25 @ 3225fps) accuracy was not what I expected at 100 yards (just over an inch) but it I'm getting decent (~ 2", several under) groups at 330 yards which I used to sight in for an elk hunt last fall. I've not shot it at long range but ended up using my .338 WM for the hunt. I measured the twist with a tight fitting patch and was surprised it showed 1 turn in 12.3" !! I have little interest in a lighter bullet but most barrel makers show a 1 in 10" is needed for 200 grain bullets. I appreciate any input or ideas on this.