Nosler book has some serious pie in the sky numbers.
In general, or for 280AI specifically?
Ben, have you tried H4831? It would likely reduce the pressure variation that results from temperature difference compared to RL22. RL23 may be the solution, when it becomes available. I know I am want to give it a go in my 280AI.
For reference, I'm running 62.0 grains of RL22 under a 140 grain ballistic tip and getting 3150 fps. I went up to 64.0 @ 3200+ with no pressure signs. Based on your velocity with the Barnes bullet, I'd guess that charge is a little too warm in your rifle.
