There is a happy medium between having a big enough sample size and introducing shooter error.
Not really; as long as a human is holding the gun, there can shooter error whether the group be 1 or 100 shots.
If you really want to know what the gun can do, lock it up in a mechanical device & fire 30 shots............then there will be a statistically valid picture of what the gun & the ammo can do.
Anything else has shooter induced influence.
MM
