1. Savage Hog Hunter in 308. Spend the rest of the $1500 on quality glass. 800 yards and more easily attainable.
2. Savage Bear Hunter, 300 WinMag, again the rest goes on the glass. Will go well over 1000 yards.
Go to the .30's for their ability to buck the wind a little better than the 6.5's and their ability to share quality bullets.
If you're still craving the 260 after a while, that HH barrel holds its value well, swap it out for a 260 barrel for a reasonable upgrade fee. Use your 308 brass to form the 260.