Have you ever shot v000 yard competition???
Do you have a 1000 yard range near by to practice??
Do you handload?
If the answer to any of these is no, you might be better off just getting a really good hunting rifle and quaity scope and shooting 600 yard competition (and hunting) for a while.
The .308 would really shine for this, and ammo (or component)costs wouldn't land you in the poor house.
1. Haven't shot competition, but interested because I have shot it as practice and just challenging my hunting buddies.
2. Nothing official. Just 12 acres of land of nothing but open flat land
3. Yes I reload