I use an old ledger book.Each gun has its info on the top of the page;serial #,caliber,etc.The load data for each gun is posted on the page.I include velocity,powder type and charge weight,primer,bullet,OAL,brass type and any other notes.When I'm developing loads,I use a small notebook with pages that can be torn out and put all the info in the box or on the block and also take a pad with me to the bench when I shoot to record velocities and make other notes.I load for over 20 different rounds,and am electronically challenged,so I feel more comfy writing down the info in a book.Maybe not as pretty as a spread sheet,but it has served me well over the years.