I am curious on why you are opting for the 3" 00 instead of the 2 3/4 00 listed under. With the groupings your seeing of placement in the 10" ring I would think you would move your consideration of ammo into another category or two. 1. cost per shells, 2. comfort of shooting. If all three fall to the 3" then by all means go for it. I just personally think the 7 pellets will be just as effective as the 13, you also will only have to find 7 (9) when cleaning the deer vs the 13 (15).