Keep an eye out for IMR4831, basically interchangable with RL22 in every rifle I've shot, usually 1-2 grains less will shot same POI or very close. Rem 7mag, 280, 270, 300WSM. Glad I stocked up when I could.
Hodgdon Superformance is also close in burn rates and I've had good luck with it in my 300 WM during load development. Now if I could only find any of the three.