High power shooter in the club here and he does 5 shot groups with his rifle. Then he verifies that load with a 10 shot string. I guess it works for him he’s a high master.
That should work for just about anyone. That's generally how I roll..Sometimes you can see a problem load even after the first 3 shots.. I know some of us don't care for 3 shot groups much, but I've ran 3 shot groups and seen a definite pattern develop while working up loads. Since we are talking AR rifles, here's one I like to post every once in a while. It's from when I was developing a load for my Armalite AR10 308:
Even Stevie Wonder can see where the accuracy node is for that one.....