As I recall, it only applied to the .177 CFX, no other caliber or models had this glitch. The claim wasn't so much that one shot better than the other, it was more that they shot better with different pellets. I know my .177 CFX was the "looser" barrel, but it is and was still a tack driver, at least at 20 yards in the right hands. Supposedly, the "tight" barrel was good with CPL's, while the "loose" one liked JSB Exacts and Superdomes. I believe this all fell under the category of "much ado about nothing much" ;-)! Later.
Dave