Quote Tony:
Especially someone who is bored shitless at present and intends to get to the Queens, but won't be a hope in hell of actually shooting.
Well you could shoot Creedmoor style, Laying on your back is not weight bearing on your leg at all.
I had a major shoulder reconstruction 3 years ago and not only was I not allowed to shoot for 6 bloody long months by the surgeon, but, I also wasn't allowed to drive and, that really peed me off.
Back on topic.
As for calibre, what is so terribly wrong with the 'umble' 308W
It is interesting to note how well FTR shooters perform against FO.
Shooting a lighter weight rifle off a bipod is giving heaps away to the belly benchrest shooters with their gold plated pedestal rests,

yet the scores do not show a huge differential.(The majority of FS shooters have, unfortunately, also gone with this gear ).
My suggestion is for a 1 in 11 or 12 twist barrel in 308W with a long throat.
Use a bipod as you save $$$$ over a pedestal rest, and, you do not need a forklift to access/leave the mound, also you get to learn how to control recoil better(how the rifle reacts when fired).
My chambers are all long throat so Sierra 2156 projectiles sit about 40 thous in the case(stops the worry about neck tension though

).
Berger Hybrids seat over 60 thou in case and shoot extremely well. Berger also recommend a minimum twist of 1 in 12 for the 155gr Hybrids.
I could, at a pinch, shoot up to approx. 200 grain projectiles which means I can shoot FS, FTR and F0 and still be competitive.