There is at least three ranges in PA that I'm aware of that offer 1,000 yard ranges.

If I was starting over, I'd go 300WM due to the fact that you can reach 2,000 yards with a 300WM...you will be hard press to go beyond 1,200 yards with the 308.

While both use 30 cal bullets, the 300WM can/should use heavy projectiles such as the 208 Hornady Amax.

Who cares about the throat since it's going to cost you some dough in ammo...if you can afford to wear out your barrel...you can afford to replace the barrel. Get a Savage and a replacement barrel will run you $300ish for a pre fit Savage barrel that will be a hammer.