The two loads I have worked up for the wife's 280 with 23" barrel are 59 grains of h4831 and 140 grain accubond for 2980fps and 56 grains of h4831 topped with a 160 grain accubond for 2870fps. Not sure which one I'll have her run for an all around load for antelope through elk but I'm leaning towards the 160 grain accubond
