 think lists that you go through a fundamentals you've got to touch feel that rubber area it becomes a tactical experience and your trigger finger doesn't leave that textured dot until you are ready to take the shot and i have done this for a young student whose trigger finger drops into the trigger guard as a sympathetic movement when other muscles are even slightly moving on the rifle on the moving the rifle on the sandbag or he's repositioning his rifle on the bipod and this has solved that problem okay