I'm going to start with my choice and why.

The SMLE No4 - either MkI or II.
They shoot a 308 class cartridge that is loaded by several major domestic and a slew of international ammo makers, are iron-sight range accurate, hold 10 rounds in their mags and can be blocked to hold only 5 with just a piece of wood. They are muzzle heavy which makes them great off-hand shooters. They have excellent, fully adjustable aperture sights. They are durable and very fast to cycle. Can be fitted with a bayonet for close quarters hog hunting. And finally, they look cool to me.

So, what's your choice and why?