I use a spiral bound notebook for each barrel I have. On the outside I write the identifiers (caliber, barrel brand, twist) for that barrel. On the inside of the cover I'll put the date installed and start listing the bullets I use and their measurements to the lands, as the throat wears I'll remeasure and change the numbers. In the pages I keep track of how many rounds in a certain batch, all the usual reloading data, chrono data, weather, scores or group size, and temp data. On the right margin I keep a tally of total rounds through the pipe and also when and how I cleaned it. I keep a lot of data! It always seems to come in handy later for reference, avoid duplicating load tests, or to verify a "good" load from 6 months ago still shoots well. This system works well for me and the notebooks are less than a buck and easy to find.
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