RE: 30.06, .270 or 7mm
I just struggled with this same question ( I think the thread is still on the first page). my best suggestion is to go with the one that you like the best. I've always been partial to the 30'06 since it was our WWI rifle, and it was good enough for us to kick the crap outa' all the bad guys way back then, and proved to be a quite capable round since then. The ammo is plentiful and you can theoretically take game at distances that exceed my shooting skill. I also like the fact that within the distances you are usually going to see and shoot at game, that big 30 cal has some serious knockdown power. If you do have to track an animal, there should usually be a nice blood trail.
David