I use Excel as well. A folder each for handguns, rifles, military etc. In each folder, I have a page(s) for each gun. Top loads are displayed at the top of the page, just under the heading. The Heading has gun, caliber, serial number, date acquired, date manuf. if available all on a singe line.
I also make note of groove and cylinder throat dia's., alloy make up for cast bullets, and sources of data if the load is from another source; also number of rounds fired.
In the data section I have columns for each bullet entitled; Bullet, Powder, Charge Wt., Primer, Case, LOA, Ext. Spread, and Notes. Groups size, bullet dia. and date are noted in the "Notes" column for each bullet.
I began keeping reloading notes in 1966, and have nearly all of my original notebooks, all now transcribed into Excel spreadsheets. I back up my work with/on thumb drives and every year or so I've made hard copies placed in a 3-ring binder. With 50+years of data on a broad spectrum of guns, I don't want to lose any...Computers are nice, but I've had some scares over the years but always managed to get the data back...be careful if you treasure your notes.
I've used the data sheet below for the past 10-15 years with good success. Be sure to back up your work, and make hard copies from time to time. I keep track of alloys, cylinder throat sizes, annealing...anything that makes the load unique to that gun. It helps, especially when you get up in years.
Best regards, Rod