Pet load with my 22-250. 35 gr. Benchmark 50 grain sierra blitzking, this load being pretty stout in my gun. A friends load using the vmax and 34.5 gr. Varget in his Savage. Remember to please work your way up in these loads. My little disclaimer....
Sounds like your velocity is pretty good however we don't know what length barrel you have. We have not run his over a chrono yet in his 26" barrel Savage.
The brass I have been using is Win. and have not experienced what you have until 3-4 loadings, then run into the occasional split neck.
You will like the 250!
ps. I also have a 300RUM, like that too!