hoppdoc
You are correct. I usually shot 4 rounds r/l, r/l with each load at the distance I have chosen.

Then baised on what the targets show, along with the notes I make [like a pulled shot], I test the best loads next time, making changes in the powder charges as necessary.

Once I find what I think is a good load then I load 20 to 50 rounds and test at different distances.