I've actually been watching for a 336 in .444, I think that would be a nice combo. Another thing that a fellow on a shooting board mentioned was they make a .44 barrel you can put on the gun and convert it to .44 His interest in this was in his state they only allowed hunting with pistol calibers, hence his wish to convert his 336 to .44 I like the idea as you could have your pistol and rifle both in .44 it would allow you to carry less ammo.
A 30/30 will get the job done though, regardless of what people say about it, its where you put the little bullet that matters, not how big it is. :;