When I owned my Surgeon Scalpel with a 26" Krieger, my load was 42.8 grains of H4350 in Rem Brass and with a Wolf LR Primer. Shot extremely well. As usual, work up carefully to that point.
Try 4831sc 139s rem brass BR2 primers. I had better results with this load for my 260. I'am at 48.2 grs. but I would work up to a load that would fit your rifle.
I've had my best results with H4350, Re19, and N160.
Never could get 4831SC to work well in either of my 260s.
Now what do I do with the 7 lbs I have left?