Re: 700-1200yrd Rifle ?
I would look at some sort of .338 w/300g SMK at 2900fps or faster.
The low end you'll have a 338 EDGE, which is a 300 RUM necked up to .338. Put a 30" tube on it, and you have a packable firearm that can sling a 300g bullet at 2900fps.
That will get you what you want for killing power to 1200 yards. You can shoot rocks and targets to 1500 yards.
My dad and I are having one of these built as I type this. SHould be interesting.
I'm using a Rem 700 accurized action, factory LSS stock, factory trigger down to 2 lbs, stainless/fluted 30" HART bbl w/defensive edge brake. FOr scope I'm going to use a Leupold VX3 LR, 6.5-20x50 30mm tube, SF, fine duplex.
There is some bigger wildcats based of the 408 chey tac case that will net you from 3300-3400 with the 300g SMK, but they take a different action and will just be a lot more money. Probly be at least a 16lb rifle as well, still portable, but still a bench gun IMO..
I"m sure some others will chime in very soon.