Good discussion though. I would sometimes pattern my left barrel to see how far my shotgun was throwing its pattern. I very rarely if ever patterned the right barrel assuming that it was throwing an open pattern.

Also, just don't use the standard 30 inch circle at 40 yards but move the patterning board to reflect hunting conditions during a particular time of year.

Of course I could have used this information a whole lot more forty years ago. blush