I don't think your going to gain all that much more from a big banger in .308 caliber than the weatherby..maybe a little in .338 maybe... A 220/240 grain .308 bullet starting out at 3100-3200 fps will just about do as much damage at 1000 yards but I hardly think an elks lungs will notice the difference. Just not sure you'd gain all that much actual killing power with a rifle you could carry hunting. Some of these ultra long range war horses are too big to carry all day while hunting, you'd have to have another pack horse to carry one or sit at a bench a watch a meadow or side-hill...a 375 action, 30 inch heavy barrel and stock to control it would be a beast to carry, it would be more but the trade-offs may not be worth it, I'd think hard about this move first.