Do you have a place to buy brass for the 450?
The lack of ammo made my pause. If I can't get brass it would be an expensive door stop. Nice gun though, and I have heard from others that own them that without the rim that is on the 45-70 they cycle as smooth as warm butter.
Oh and I am not in any particular hurry, I shot what little cash I had left on another rifle a few weeks ago that popped up and I had to use the funds to pounce before it was gone.