Pretty sure most everyone would agree that a 12 gauge shotgun would be the most versatile firearm ever created. Not much else that even comes close.
So I made this about rifle calibers.

When putting together a "Do it all" rifle to meet my needs for just kicking around the woods in and out of trucks, 4 wheelers, tractors, and just leaning in the corner at camp I chose a .308 and cut the rifle down into a carbine.
What's your favorite that covers most of your needs? Any specific reason why?