Bauer,
I just checked the Idaho state regs and it looks like Idaho allows a " double barrel" (not all states do) for ML hunting. Idaho also makes a distinction between a ML hunt and Traditional ML hunts. It looks the Kodiak double would work for both, and a .54 cal is big enough for Elk too. One thing I noticed is that during the Traditional Hunt you will have to use round balls.
BTW - I DO NOT hunt is Idaho and only spent a couple of minutes looking at the regulations. You need to double check everything I said, you can go to:
http://www2.state.id.us/fishgame/com.../bg/bigame.htm
and down load Idaho' s Regs for yourself.
Good luck and enjoy the rifle.