Its interesting. Like many, I started out upland game hunting (mostly pheasants) with a 12ga. My dad handed me a Winchester Model 97 and off we went. By the end of the day my knuckles were dragging on the ground carrying that gun, but I seemed to hit a few birds. Finally I graduated to a Mossberg 12ga. Swung like a club, couldn't hit a barn unless I was inside it. Finally, graduated from college, made enough money to buy a "good" gun, a Beretta A303 semi-auto 12ga. Sweet, forgiving gun. Suddenly I could shoot and birds started dropping. Didn't really think about the gauge, but as I started shooting skeet and sporting clays the recoil of the 12ga started bothering me so I acquired a 20ga Beretta O/U then a 28ga. Suddenly things started to click. I didn't need to fill the sky with lead, I just needed to shoot better and the smaller gauges allowed me to do that. I now hunt exclusively with a 20ga for wild pheasants unless I'm really feeling "on" at which point I switch to a 28ga. The only thing different between the gauges is the amount of shot in the pattern. If you center the bird with a 28ga it will die, but distance is a factor as the smaller number of pellets thin out farther away, so I put up with the "cannon" - a 20ga. Shoot the gun and gauge you shoot best and don't worry about anything else.