Sadly I think a lot of landowners aren't truly aware of their exact boundaries, especially those cases where the land has been passed down over the generations. The property boundary may have effectively been a fence line their whole lives, whereas the legal boundary could be significantly off that fence line. There are certainly landowners who knowingly try to buffalo hunters off of "their" land, but I've ran into others who were truly surprised to learn what they thought was a boundary or their land really wasn't. Although just as its a hunter's responsibility to know where they are it should also be a ranchers/landowners responsibility to know as well, I can see how these false perceptions can perpetuate over time when you've grown up on the land.