Well, we have to break the 16 gauge chain then. If you are all about hunting, I like a 12 gauge, with some 8 shot and the most open choke you can get (so less bb'crap em). If you are hunting little ground squirrels, most anything will work, but I've have seen some pretty dang big tree squirrels, which I wouldnt like a bird shot .410 for. I would have to say if I was limited to one gun (please god don't ever let it happen).. It would be a 12 gauge. Plus I'm not sure how it works where you guys are from, but when we are out squirreling, its open for rabbits, and grouse too, so have something for everything. But really for squirrels, it don't matter what I like, it's what you like. Try different stuff, pretty much anything will kill a squirrel. When I was a kid, rocks were about as good as any gun :-D