I'm with Bobby C. I like to start on the bench and get my 30 yard zero and windage set right.... on a calm day.
Then, I like to shoot 5 shot groups at all my marked yardages in the position I will compete from. I use the center of the groups for my marks. This will account for the way you break your shots on average. The more shots in the group the better your data. The computer programs are a good check, but unless you know for sure your exact BC and scope height, then it's only a starting point.
For me this was very important in WFTF class where less support is allowed, because I tend to pull my shots up and right a little when shooting without a bipod.. That's why I'm doing better in Hunter class now. You can kind of compensate or incorporate your shooting style into your dope sheet.
As far a "dope sheet" goes. I don't like to put my data on a card that I might lose or forget to bring. Also, it takes longer to look at the card, than just putting the data on the sidewheel. If you use a dope sheet, then at least tape it to your gun or scope, so it's always with the gun.
Wayne