To be fair, with ANY gauge shooting lead at long range you generally only have a viable pattern in the center “core” of what the pattern would have been at closer range. The fringe of the pattern has, to a significant degree, been lost to stringing and pellet deformation. Therefore the outside of the pattern is not as dense as it was, and loses effective range earlier. Result is you can make some impressive hits at that range if you center it. But the real question is whether you are shooting a pattern at that range that is likely to wound birds if you hit them just outside the core, ie is the ENTIRE pattern still a killing pattern? Sometimes yes, but In many cases its not. Again this applies to any gauge nearing the end of its effective range. You can get around this in two ways—shoot more shot or shoot more efficient shells (ie harder shot, better wads). One comes with recoil, one comes with a price tag, pick your poison.