I think we used to do something called a "T-Test" in an attempt to determine is a difference was real or simply "lost in the noise". I don't recall the math right now. One thing I think we needed was sample size.
I see you reference "Average speed for four five shot groups." Is that the average of 4 averages or the average of all 20 shots?
A rough rule I've used is ES about SD x 3. It doesn't always hold true but is usually pretty close. If that holds true here, you had ES of about 36 on one test and 33 on the other.
I've shot two tests of the same load in the same rifle and seen similar differences between the averages. Seeing 9 fps in the 2400 fps range and 5 fps in the 2600 fps range, gut reaction is "There is no difference".
Great data, Charlie. Thanks for sharing.
