When I was shooting High Power rifle I kept a log. On Pistols? Never have. Like many here I have a safe full of firearms, but most of them only get taken out to the range on occasion. I have a couple of handguns and rifles that are "for serious" that get shot on a weekly basis. Ninety nine percent of my shooting is done with hand loads and bullets come in boxes of five hundred. I just keep a rough count of the number of boxes used with each gun and it helps me keep up on maintenance intervals. I've never felt the need to get any more complicated than that. I also hate to reload. I do it because I like to shoot so it's a necessary evil. Once I find a load that works well in a given firearm I tend not to change it. Powder shortages in the last few years have caused me to experiment more than ever, so I do keep a list of appropriate loads in each caliber.