Then again I believe Karla mentioned that Leo Harrison III would check his beads before every shot!!! I try to do the same. After I call pull, I never look at them again, as I'm looking down range in a soft focus looking for the target I called for, and continue to watch it until it breaks!!! Its easy to get fatigued and get sloppy gun mounts toward the end of any 100 target event. Even--- More so in the hotter months.
How many pistol shooters on here remove the rear V sight from there pistol's when they bull's eye shoot??? That's what your doing when shooting a shotgun without a mid-bead!!! Its just that a shotgun is a little more forgiving than a single projectile firearm!!!
The mid bead helps a shooter (especially a newer shooter) properly align his/her eye (left, right,and up) before they call pull. Think 3 dimensional here, not just left and right!!! I do catch myself getting sloppy from time to time and realign my eye before I call pull. Sometimes I forget to check and get too sloppy and don't notice it until I hear the word LOST. Guess I'm just not perfect, just human. Now go out there and shoot whatever way make's ya Happy!!! and break em all Jeff