Out of my match gun, 26 inch barrel. I needed to push the bullet over 2850, IIRC, not home now, so can`t refer to my notes. I didn`t have the pressure issues with 4320 that I did with Varget. The a-max stayed SS at 1k. Accuracy is excellent.
YMMV. Work up using a crony, if you have one. Otherwise, you will need a buddy to stand under a target at 1k to tell you if the bullet is coming in SS.