Welcome to NitroExpress. And congratulations on your new rifle.

New Doubles are always a bit stiff. They do need to be shot in, 50-100 rounds. There are always a few that don't but they are in the minority. The closer the tolerances the tighter the fit. Particularly the hinge pin. This is good.

An ejector will always be stiffer than a non ejector as the ejectors need to be cocked if fired. You are setting the springs. You may disconnect it (have it done) and that will allow for the barrels to loosen up and fall freer. Some people like non ejectors.

If you are concerned that something may be rubbing look for galling. Try a light coat of smoke or machinist blueing on the face, hinge pin, and the locking lugs and look for spotty contact and rough spots. If you find any have a very competent Double Gunsmith rectify it. A Krieghoff warranty station will not be up to snuff and they will have to send it out.

Bob Cusack has used a 470 and a 9.3x74R as a back up on Brown Bears and Moose for years. For that kind of work they are as good as you can get. Sometimes a scope is very handy for sorting animals out of thick bush though that's for sure.