I start the same way you're doing, but transfer the data in a structured format to my computerized recipe book.
Makes it easy to search, slice and dice any which way by caliber, bullet, rifle, date, powder, etc. In anyway that makes sense to you.
The important part is dumping all the data into the collection basket. Figuring out which factoids are important to you can happen as you go.
I do the same thing with hunting results. Make the chicken scratches in a handy little notebook back at camp each night while still fresh in my feeble brain, then get them into the computer when I get back to the shack.
