Check out Zack Smith's site; he's got a good writeup on LR scopes. For budgeting purposes, I would assume $1800 for the scope and another $300 for mounts.
You're probably going to need to reload. I guess there's good factory long range 7mm ammo out there, but I've never seen it. I would budget $1500 for the first year worth of ammo (assuming reloads) and another $800 for a new barrel (you’ll probably be due a new one). If you do it right, you should have a decent (I don't know, <50%) chance of consistently putting lead on hog by then.
You’re going to need a good range finder (really good).
If you go with a factory rifle, just know it's hit or miss (
) on getting a good shooter. If you go with a custom rifle, it may take several months to get it. You could spend less than $1000 or several thousand, depending on factory / custom / crazy custom…
I think what you're talking about is a really great idea (
except the part about trying to shoot hogs at 1k...). I would decide if I wanted to shoot at long ranges or if I just wanted to get rid of some hogs before I spent a lot of money on this. FWIW, I would try to trap the hogs and buy a long range rig in .260 just because (why not…). If I really wanted to shoot them at 1k, I would get a Browning M2, but I don’t have money for something like that, nor do I have hog problems. Either way you go; Good Luck!