To get back to the content of the original thread, I have now watched the chap's video, and would be more concerned about the regulation of his cheap Turkish over-under than about the patterns.

His second and fourth shots using the top barrel were about 9 inches higher then the patterns shot with the lower barrel. So are these barrels parallel or was he just unlucky?

Of course trying to get any valid data from a single shot is a bit daft, as we say over here...

HB