The idea here is to just take raw numbers and random cartridges of the same type (other than the differences in primers) and test velocities. It is my hope that over time, differences such as case capacities of different brands and projectile hardness, and O.A.L. will average out.
My Hypothesis is that the small pistol primers will have a larger standard deviation. The idea being that the powder is ignited less evenly. So far the results are inconclusive as I will need thousands of rounds to correlate the data. However, the preliminary results do in fact so a larger SD in the small pistol primed cartridges. This is most definitely chance at this point.
Large Pistol Primers
Extreme Spread: 101
High: 725
Low: 624
Mean Average Velocity: 671.779
Standard Deviation: 27.7562
3 Sigma: 83.2687
Number of Samples: 19
Small Pistol Primers
Extreme Spread: 126
High: 724
Low: 598
Mean Average Velocity: 674.1
Standard Deviation: 30.999
3 Sigma: 92.9971
Number of Samples: 19
Large Pistol 2nd Session Combined
Extreme Spread: 102
High: 725
Low: 623
Mean Average Velocity: 673.097
Standard Deviation: 26.5129
3 Sigma: 79.5388
Number of Samples: 30
Small Pistol 2nd Session Combined
Extreme Spread: 126
High: 724
Low: 598
Mean Average Velocity: 675.14
Standard Deviation: 27.3608
3 Sigma: 82.0825
Number of Samples: 30