DUNCAN DEVICE
The Duncan Device is a pellet holder for your offhand stand that lets you arrange the pellets in the shape of your 10-bull target. You can number the stickers in the sequence recommended by your coach to maximize your NPA (Natural Point of Aim). It was developed by the nationally-recognized youth shooting coach, Jack Duncan. The originals were of cast green plastic with a wood backing for durability. Stickers were included to number in the arrangement best suited for you.
We no longer sell this product, however, it is a great idea and could be adapted as a DIY project.