I have a 280 rem with a 22” pacnor barrel and with RL26 I am pushing a 140 grain Ballistic Tip at 3180. This is producing 1/2” groups with no pressure signs, so with the AI it should be able to get you around 3300fps.
I also tried H4831sc and was going at a Nosler book max of 57 grains. Accuracy was awesome but speeds were only at 2800fps.
