The only improvement I can think of would be to make the cartridge exactly the same, but leave off the dad-burned belt!!
That is the only real complaint I have with the 7mm Rem mag or 300win mag or Wby mags, or 350 rem mag, etc... etc... Belts are a useless hinderance on a bottle necked cartridge.
Bottom line is that the 7mm Rem mag is a fantastic do everything cartridge. From antelope to moose it can do it all. I'd step up to a larger cartridge for large NA dangerous game though.