I generally load 3 or 5 rounds. Conserves on some components. Then if there is a charge I like I load more there to confirm. Sort of a hybrid.You do you, don’t let me sway you. Most statisticians would tell you my 10-round sample is statistically insignificant, too.
If you’re satisfied with any of your 3-round tests, I’d then load 10-rounds to get a better idea of SD.
The Hammer method is an interesting shortcut. They recommend loading singles until you get pressure signs, back off a grain or so and load a batch for ES and accuracy testing.
