How many rounds for relevant chronograph data?

Most interesting to me is arsenal's accuracy tests for 30 caliber match ammo was 270 shots from barreled actions laying in a Mann rest. Bullets from 3 or 4 different die sets were used. Mean radius had to be under 3.5 inches at 600 yards.

It's also interesting that the most accurate benchrest stuff at 100 yards shoots almost .3 inch extreme spread.
 
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