My shotgunning skills make my 28 ga useful only early in the season when there are dumb juvenile birds. My 20 weighs almost as much as my lightweight 12 so doesn't get used much for hiking. I have a 7# 12 ga semiauto that works for most of the season. An old full-choked Ithaca 37 handles late season birds that flush wildly.
So, how are your shooting skills, and how much are you willing to carry for miles?