Nitro, I looked at the Parker site. Down a few posts is one by Doctor Drew, I tested my L.C. Smith Longrange 3" chamber with 32" barrels both full and the recorded distance was actually 81 yards. At this distance, a 30" circle looks around 3 inches and the duck in the circle looked like a starling. At this distance you most likely could not identify hen or drake unless in bright light. I myself would never shoot at anything that far.
As stated on the site, it does happen, but you have a greater chance of wounding then killing.
