I use a lot of H110 powder. I reload for .357, .44, and .500 S&W. The charges go from 15-43 grains with those calibers and the bullet weights I load for. I always sort of ball parked it with the micrometer barrel adjust screw and then fine tuned it until I got what charge weight I wanted. This normally took 4-6 tunings to get it dialed in. The papers that came with the measure mentioned making a graph, but I figured it would look more like a scatter plot and not worth fooling with, but that's definitely not the case. X=barell reading y= charge weight (grains) That's the best straight line I could do through those points.....and it's a good one. Using the formula for the line, I'm not off by more than a .2 grains when checked on the scale. Just thought I'd mention it in case you had a powder you use for multiple calibers. It might be worthwhile to make one of these.