I'm researching powders that will fill the case without much if any compression, and give full power performance with optimal groups.
So far the best are RL-7 with lighter bullets, X-Term with 180's and 200's. TAC may edge X-term with 225's, but with some compression. I'm not shooting 250's, would if it was a Whelen.
DF
Shoot you some 250gr Speer Hot-Cor RN or SPT over Win 748. Post a picture of the big smile it puts on your face.