http://www.longrangehunting.com/articles/custom-turret-systems-review-1.php. To go along with the idea of several different loads for a rifle I thought this would help. This company makes labels for your turrets. In the article the author made one with drops for 2 different loads. With this system you would not need to carry drop cards with you. It would be on your turret and at your finger tips. Anyone try these labels??