Got any results?
I did a ladder on the weekend, got some good results.
Lapua brass, CCI 250s, 300gr Scenars, 3.681" COAL. Sweet spot appears to around 86.5 to 87.5gr Retumbo, giving 2680 to 2705fps. No pressure signs up to 88gr, but not really tempted to push it.
Going to shoot some groups this weekend to confirm, and do the same ladder using Berger OTM hybrids.