I just keep a dope book....well..I use a cheat sheet that looks like a deranged scientist scribbled sanscrit on a cocktail napkins.
I just printed out some dope sheets to be made into a book. Nothing trumps actual range notes with detailed weather report.
Keep a detailed book on each rifle and different ammo. It'll be a selling point when your kids are selling off their inheritance.
I recently discovered StrelokPro and boy am I glad I did. I love the KISS interface and being able to input odd yardage like 582 yds and get dope. Seems very accurate for my rifles too.