Cool pics!
As for carrying a ton of ammo via belts and such, I guess those guys did it because they could. Guys I've seen with full ammo belts always reminded me of illiterate Mexican banditos. As for me, a magazine-full in the gun and a couple spares in my pocket always sufficed. I guess if I were headed 100 miles into virgin wilderness I would take a few more with me in case a survival situation were forced upon me. Probably be better off renting a sat phone that would weigh less and take up less space in my kit than a couple boxes of survival ammo.