@WTFJohn what are the numbers that prove 6mm isn't the literal worst?
Again, from Charles Ruth, who authored the study and presented on it:
There were no significant differences in the efficiency of weapons when grouped by caliber.
It doesn't seem you actually want to have a conversation around that study, you want to cherry pick things to support your position rather than taking the study as a whole and learning what the overall takeaways were. Good luck with your trolling going forward; I'm out.