I have the same B-14 rifle in the Ridge model and it has shot everything I've tried in it from 55 grain to 70 grain bullets extremely well. I use IMR 4320 powder in near but not max book loads. I like the rifle a lot....
4320 has been my favorite powder for the 22-250 for years. It's being discontinued from what I've read, but I hopefully have enough to keep me going in my current 5 horse stable of 22-250 rifles that I load for.
Varget and 4064 are other good powder choices that should work well.
