I was using H4350 and CCI200s. I don't recall what the freebore was with the reamer. It's quite short. I only measured the COAL at 2.760".
I got all the way up to 48.7 grains and 3144 fps before stopped due to pressure signs. This was with 260 Lapua brass.
Barrel is an 8-twist Lilja. Hopefully...