What kind of accuracy are you getting with the .228 Buffalo Arms bullets? Have you a receipe for Reloder 15? I have a lot of that powder, favorite for 300 and 250 Savage.
If you are replying to me, I don't use RL-15 in the HP just #7 and my recipe is posted. Accuracy so far is just over an inch at 50 yards. Still working up my load though Started with 21 grains and am up to 22-1/2 now with groups remaining about the same.