My current Norma is built on a LH Model 70 stainless magnum action also. I had a Douglas #4 1-12 twist put on and cut to 22"
If I were to redo it, I'd probably go with a #3 though.
My go to loads are 225gr Barnes TSX's or 250gr Noslers both with max charges of IMR4350. I've also played around with 200gr Hornady's and found the accuracy to be just as good with a whole lot less recoil.
