This is kinda why I don't pattern my shotguns. You can't evenly distribute randomness, entropy won't allow it. I'd be more concerned with Point-Of-Impact (POI). Looks like the right barrel (or 1st shot) of your Purdy is shooting a bit high (Maybe you held high on the dot?) I wouldn't got beyond 35 yards though, just in case the patterns get worse.....What chokes are on those barrels you shot?

Although the patterns aren't ideal, they would work if they are centered on what you're shooting at. Just out of curiosity, is that chilled lead or magnum shot?

Mike Doerner