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I use index cards. Once I get a gun sighted in and working on load development I place a birchwood dot on the index card and shoot a group. I write the load data right on the card and then place it in the card holder. It has a place for each round to be seperate and each gun. I eaven have a card that list every powder, primer and bullet that I tried for a gun that I tried and the starting charge to ending charge with the load that showed the best promise if I want to go back and play with setting depth.