Sounds like flat out cheating to me ...
I've seen it so many times over the years, people shooting .22 prone 25yd small bore postal target competitions, shooting nine then putting the sticker on the last target to shoot the final "though the sticker" shot .....
Dirty rotten tricks ..... and too many cheats...
I am just happily in competition with myself these days, a three inch group with my No4 at 100yds and I'm happy!