So as a newbie, let me ask a question. Am I reading shell boxes right, a 3" 20ga can have about the same amount of shot as a 2 3/4" 12ga -- well less 1/8 oz anyway? If this is true, why don't more upland(pheasant) hunters use 20ga? I am looking at a new gun and have a limited budget, so a 20ga would get me more in the weight range I want, and I'm not afraid of the recoil. Thanks!