Paul - we used to have a steel silhouette shoot at Hefley Creek - shooting 2 1/2" diameter steel pins at 25 yards, then the chickens, pigs, turkey's spread out at various ranges out to about 110yards or so.
It is quite interesting, that year after year, the best smoothbore scores rivaled those of the best rifle scores. The smoothbore shooters, 2 primarily come to mind, used patched round balls and were incredibly steady shots - their follow through showed no movement. If they had a flash in the pan or straight miss-fire there was NEVER any movement - steady and solid as a rock. The point of this post being, a great shot with a smoothbore can be competitive with average shots with a rifle - out to 110yards, at least.
I have see those two guys ring steel gongs with their 20 bore smoothbores at ranges most rifle shooters missed. $#@*-house Luck? - possibly, but they do it so @!*% often.