Could it have EXCESSIVE RECOIL ??

You betcha! If they max the load they can best the 375H&H by
200 fps.Personally I think that would be a mistake!!

I think they need to load it down to 375 H&H velocities.With a wider more efficient powder column it should have the same recoil in a similar weight rifle with the same barrel length or possibly even less.Like many others here I don't think loading it up gives benefits worth the recoil endured.

As stated above I would load it down to 375H&H velocities, load it with a North Fork bullet and put it in a lighter weight rifle.More recoil? Yes, but what a great combo for backcountry packing.