Re: Wanting to build a rifle for F-Class
If'n it were me...
I'd find a lighter (weight) profile if you can. That one weighs more @ 26" than a medium Palma does @ 30" - and what does it gain you? Nada. That weight could be put to better use for something like more options for a bipod beyond a Harris or GG&G (both pretty good anyways), and if you're using it for hunting, no point in lugging that weight around if you don't have to. Those extra inches of barrel length are essentially 'free' muzzle velocity. Not much, but every little bit counts if you intend to shoot 1k. Yes, I know there are people who claim to be able to shoot 168s @ 1k from a 20" LTR - just never seen them on the firing line at any match I've ben to. 26" should be fine - 600yds and in you'll never know the difference. 1k - the wind is going to be troublesome for anybody, regardless of what barrel they have ;)
I wouldn't get *too* hung up on the chamber/throating - the .308 Winchester is so forgiving in this regard its not even funny. And a 'match' chamber for a .308 is still fairly 'sloppy' compared to a no-turn chamber in other calibers. There is a 'match' chamber floating about that is basically a WTC 95 Palma reamer (normally used for very short chambers with a S155MK (old style)) but throated for a 175gr SMK (or Lapua 155 Scenar). Actually turns out to be a very versatile configuration - excellent accuracy with magazine length ammo, but not so short of a throat as to preclude experimenting with heavier bullets, and not so long as to make shooting lighter bullets difficult.
Twist rate... I'd go 1-12" myself - it'll spin 190's easily, shoot 175s like a house-afire, and stuff 155s into the X-ring all day long. Then again, so will an 11, or a 10. I just tend towards the slower twist that will get the job done if possible.
The stock you have will probably be just fine - but add that adjustable cheek piece asap. Go to Karsten's Custom Camo if you need one - best $65 on gun parts I've spent. I have several of them, and several other shooters on the U.S. F/TR team use them as well. If you don't have a thumbwheel cheekpiece, these are the next best thing IMHO.