One thing you might consider; I find when
shooters change targets ( and distances ) they tend to get in the habit of shooting a
round off and and then looking up at the target.This results in a slight upward movement of the barrel causing a high hit.
( as much as 12-14" at 25yds ) This may not
apply in this case. I know diffrent colors
tend to bleed out on me; esp. when shooting
brightly colored plates at 50 yds.