Long gun, 203. (and phewy on your "one ammo type" rule, my pick takes what it takes and I'm taking it :P )
Side arm, none, just extra weight to hump around.
Blade,
http://www.gerbergear.com/product.php?model=7171
additional gear:
http://www.gerbergear.com/product.php?model=1420 and of course, a multi tool like a Leatherman or some such.