While it appears that there are no significant differences in average MVs as a result of SRP vs. SPP, you might consider performing a statistical T-test on your data to quantitatively confirm that. Pretty simple to perform that test, easily handled by Microsoft Excel. See T.TEST function

Quite a few years ago, I did a fairly rigorous test to determine if there were statistically significant differences in average MV due to SRP vs. SPP using different loads in .38 Special. There weren’t any at the 0.05 level. Very crudely, that means that you can have about 95% confidence that there is no difference in average MV due to the type of primer used. It is actually much more complicated than that, but there no point in clouding the issue any further as even professional statisticians do not agree on an exact meaning of a significant confidence level. There have even been Supreme Court decisions on that topic.