I don't bother with this either...I did try for a while, but it mostly seemed like a waste of time so I gave up.
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I just keep mine in my note section on my phone.
Winter is for planning, inventory, record keeping, maintenance and reloading...
I use Excel to manage my entire life (budget, investments, diet/exercise, birthdays/holidays, fantasy football, car maintenance, firearms, etc.). Knowing things like how many rounds the G17 has on the current recoil spring or how ASC 20 round mags didn't lock the bolt back on one of my ARs in 2011 gives me peace of mind.
As a 50 something engineer, Excel is really the only tool I still know how to use effectively - so I use it with extreme prejudice.
-SlimeDog