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James K said: Much ado about not much. Rounds of factory ammo in a box can vary more than 15 fps +/-, and it is about impossible to get even the most careful handloads much under that variance.
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James, here's two of my chrono reports. The first one 2 sets Federal Gold Medal Match and a string of ten shots loaded with a Harrel volumetric powder measure.
T= spread from high to low M= median S= standard deviation
This second one a few days later show three groups loaded with a RCBS ChargeMaster that individually measures each load. I was also testing different neck tension. As you can see in two out the three groups the T= spread from high to low is less than 15fpts. So, it is not only possible but it is doable.
