T-Mac made a good point about keeping notes. I always used to just put my load data on the box the ammo was in, and never kept any permanant records. I wish I would have kept notes all along. Now that I have my chronograph, I write it all down in a 3-ring binder that goes to the range with me. Here's a scan of the form I use. I made it on WordPerfect. If anyone wants the original file so they can edit to their own specs, I can e-mail it. It seems to work for me.