Shoot Right, then Left, ........

Shoot only as fast as making sure you have the exact same sight picture for each set - no point in trying to shoot
a group if you pull the trigger with the aim point in different positions.

If I am testing loads, to get a general idea, I shoot 4 per load - 2 right, 2 left. That's initially if I have made up a spread of different loads.

That's my HO, some others may have different opinions.