No shotgun will ever deliver an "even" pattern. "Even" meaning pegboard layout patterns. All patterns are Rayleigh distributions (OK to think of them as Normal distributions). A cylinder pattern is identical to a full other than the cylinder blooms quicker and, likewise, withers quicker. If you captured a cylinder pattern at 60 yards, you would find it is still a Rayleigh distribution of the shot. Further, you would find that those few pieces of shot that were in the center at 20 yards would still be there at 60 yards. This is why those who have extra small aiming error can make breaks at distances where the pattern is clearly too large to be effective. They would probably have similar results with a .22 rifle.
DDA
