Try this load. its what I use. 40.5 gr of H4831sc, 105gr berger vld, lapua brass, federal match primer. I have a 1/8 twist 243 barrel from brouhton, but its tight necked at .2.69. 5 bullets into 1hole.
If you are looking for the OCW load you should be looking at the 40.5-41gr. load. The 40gr load shifts the point of impact and the 40, 40.5, 41.0 and 41.5 are all within 1moa. I would try 40.7 and seat the bullets +.005 and -.005 and see what those do. The whole concept of an OCW load is to be in the middle of a point of impact node so to speak. I would also shoot them at at least 200 if not 300yds. as well.