The widest spread I've ever seen came from the disc shot loads that used to be available (from Orvis?) Pretty nice patterns, out to about 20 yards. After that, the pattern pretty much ceased to exist. I didn't have a 10 foot wide pattern sheet, but since most of the pellet strikes weren't on the sheet I did have, I assumed that they had to be somewhere else. On the other hand, given the aerodynamics of disc shot, I'm not sure how much danger they would pose very far out.