I was close to doing a 338WinMag LR rig some years back.
I calc'd 300gr SMKs loaded to 3.55" would fit easily in a Rem magazine, and should make 2550 fps at about 60k psi, via moly, RL22, and a 26" bbl.
The downrange energy/drift numbers are impressive.
Trajectory is not that bad either, beats 308Win/175SMK 2600 fps.
With the new Berger 250s/300s, and newer powders, it only gets better.
I think the 338WinMag has a lot of potential for LR use, and barrel life should be very good to boot.