I think I would carry anything I could get my hands on
![Very Happy :-D](./images/smilies/icon_biggrin.gif)
I would carry a Shotgun, realatively easy to find shells at first (hell even Walmart sells them)
I could pack my own if needed. A shotgun isn't heavy, at close range you don't need to be an expert marksman to be fairly effective in it's use. You can saw it down for wider spread, or leave the length for range. Doubles as a club in a desparate situation (i.e. out of shells)
I would carry a crossbow as a back up, also light and could reuse arrows (or bolts) for a while until thet are too damaged, also in a pinch, make my own bolts or arrows.