H4831 with the 180 AB's in 300 WM is a very good combination. I've used it a lot. I don't think Nosler lists this powder in their manual but Hodgdon lists it as a max load of 73.0 grains. Fed 215 primers, Norma brass. Bullets did well seated .020 off. This was a consistent 1/2 MOA load. Just work up your load and see what works best. Good luck.