I've seen guys stretch the 6.5 CM LRP (IIRC) in crazy LR ranges as-is. There's a guy in youtube ringing the target at 1300 yards. I think both the .260 and the 6.5 CM will satisfy your requirement. I only have one rifle in .264 cal at this time; it's a 6.5x55 Swedish Mauser carbine (18' barrel) made by Carl Gustav ... it's been around longer than our venerable .30-06.

Remingtonman, just want to comment ... "love to see a screen name like yours also appreciate the Savage rifles". Cheers!