German A. Salazar is a good writer on technical aspects of shooting. His primer articles are very thorough. The results on the Winchester and Lupua brass indicates, he can't see the difference either.
I suspect (German confirms in article) the variations in the human aspect of shooting prone overwhelm the small technical variations in ammunnition. Which brings you right back to the point of practicing the physical skills of prone shooting instead of searching for a mythical pot of gold at the end of a rainbow.
Shooters talk a lot about searching for a competitve edge with equipment. I don't believe there is a competitive edge other than yourself. It all comes down to how well trained and practiced you are as a marksman that makes a difference. The time you spend on searching for the "Compettitive Edge" is a waste of important time that could better used in training for your next match, rather than adding more variables and unknowns to your shooting.
The good news is it puts us on a equal footing with champion shooters like German, because we can all aspire to reach his level of proficiency in shooting. All it takes is the committment to become a better shooter.
German's statement, " I don't see any magic - not that I expected any" says a lot about how we get over-focused on small details and ignore the big details, namely ourselves, and what our shooting technique contributes to the accuracy question.
Jcummings, good post and excellent article, everyone should read it. You should pin this on the board for the next guy that is in a tizzy about his brass.
Julian