I am not in the best of shape, so humping a full size gun through the bush is more challenging than I would like. For that reason, if I find myself needing to go 'hunting', I will go with pistol only. It allows me to be more manuverable and quicker than I would be otherwise. I have a high quality GBB that shoots 350+ with .2's. This year I will be running it with .3's for extra accuracy. I normally carry around one hundred rounds for it, so I don't tend to run out in a regular length skirmish. SMG's are a different matter: there, I carry around three hundred rounds. More than that and the weight of the mags becomes quite onerous (at least for an old guy with a heart condition!