Well, right now 300RUM brass has been hard to find if you're looking to reload.
I was trying to avoid the belted magnum cartridges. But could you do a .300 win mag AI? Would it gain enough to be worth it?
Yep, something to consider if a ~200 FPS more velocity quest is worth the trouble.
The .300 Win Mag is very capable up elk size game at 1K yards with the right load.
IIWY, I'd re-barrel it with 26"+ and 1:9" twist for the heavies that require it.