A buddy who's just getting into F/TR bought a 12FV from Cabelas. I ran a bunch of test combinations based on previous experience.
Nosler 69CC, 25.0 gr Varget, WSR, LC brass. Seated .005" off the lands, we're getting 5 shot groups in the .2's with one .165".
It definitely shot better after 200 rounds had gone down the tube, but he's more than ready for 600 yd F/TR.