I've done that for 37 years. I maintain an FFL log, that way I can keep track of firearms I own, and have sold, where I got them, and where they went.
For each firearms I own, I maintain one of those composition books, for the weapons I obtained before computers were common place, since the introduction of the IBM PS/2 Mod 30, I maintain said logs using a microsoft word formated document allowing me to keep both digital and print copy in a binder type book. In it, on the first page is acquisition information, date of first cleaning, what ammo is used for each range trip, how the weapon handled, accuracy, how the ammo handled, how the magazines worked, plus, range information such as distance, climate, wind speed, direction.
I keep notes like these so that I know how each individual weapon handles, what ammo it prefers, plus it allows me to keep an accurate count of ammo fired as that tells me what maintenance must be done on the weapon, for semi-auto handguns, it let's me know accurate round count so that every 3k rounds I can change springs and such, plus, most important, when the weapon gets into the very high count range like my 1st gen Glock 17 with nearly 96k rounds, I can send it in to the factory for inspection and or replacement.