Witch Doctor: Alpha OCD Lapua Brass Comparison

The purpose of this video is to present data from comparison testing regarding Alpha OCD (Trademark) and Lapua brass in 6 Dasher. Overall, Alpha OCD exhibited higher velocity relative to Lapua (average of 27.1 feet per second). Lapua exhibited lower standard deviation and groups size. Of the three powders utilized in testing (Varget, N140, and IMR4895), IMR4895 exhibited the largest difference in velocity with Alpha being 29.9 feet per second faster than Lapua, and Lapua showed smaller standard deviation and group size. When it comes to differences within Alpha, there were no differences regarding standard deviation and group size between Varget and IMR4895 and this was the same for Lapua. With Alpha brass, lower velocities were associated with higher standard deviations; this trend was not present with Lapua given that Lapua exhibited small standard deviations along the entire range of velocities.
UPDATE: due to requests to assess for differences regarding groups and standard deviations while controlling for velocity, I performed "yoked control" statistical analyses. I paired velocities shot with the Lapua and Alpha OCD brass that were within 10 feet per second of each other and was able to pair 28 sets of 5-shot groups. When I ran the same t tests as the above-mentioned analyses, the same pattern emerged whereby Lapua had a statistically significantly lower standard deviation (p=.028; Lapua average = 6.35, Alpha OCD average = 8.09) relative to Alpha OCD and smaller groups (p=.020; Lapua average = .5718, Alpha OCD average = .6900). This follow up test suggests that controlling for velocity does not change the results of the primary analyses.