I started visiting this forum about the same time I started shooting. I noticed that everyone seemed to know how many rounds were fired, what brand of ammo they used, and how many and what kind of ammo problems they experienced. I didn't know why they kept track, but I figured that was what shooters did, so I started doing it. I figured I'd find out why eventually
I just use a simple excel worksheet to record date, location, gun, caliber, rounds fired, distance, and ammo brand. There's a "comments" field for any problems or observations I want to record. My main sheet is in chronological order, but I have a second sheet that takes the info and sorts it by gun and calculates shots fired by that gun. I recently added a photo/serial number record of my guns, and plan to add maintenance records when needed.
I generally use 8.5x11" targets that I downloaded to my pc. As I shoot, I record the above info directly onto the targets. When I get home, I transfer the info from the targets into the spreadsheet, file the targets (and should there be any particularly impressive looking ones, I take a digital picture and put it on my pc. I don't have grandkids so I show off my targets lol).
All of this sounds painful and annoying, but I actually enjoy it. It prolongs the range experience. Come home, peruse the targets, record them, file them, take out the guns, [STRIKE]fondle[/STRIKE] clean them, put them away... nice relaxing way to pass an evening.
Who knows. Maybe one day the info will prove useful lol.