There is of course no such thing as "near" tresspassing. Either you are or you aren't so you should clearly understand that unless the guy shoots across the border or steps across the border,there isnothing legaly that can be done.Certainly no legalway to challenge where or the way he positioned his stand on his own property. IMO, building a barrier or throwing soap on his property is childish. Crossing the border and changing how his stand is hung as manuman did is really foolish not to mention arrogant and illegal. The soap thing is surely illegal as well. Don't stoop to such nonsense. Now although you can't be certain he plans to shoot acrross the border (might be using tree for cover for example) it is reasonable to believe he plans to so asking your grandfather to give him a call just to make sure he understands that he doesn't have permission might be a good idea.Any chancehe has permission from your grandfather? In any case, my advice, any time there is a touchy situation like this, is to take the moral high ground and talk to the fellow and make sure every thing is clear between the landowners. After that if you find him shooting or tresspassing then call in the law but like I said, don't stoop to childish tactics that may only escalate a situation unecessisarily. If you take the advice of some here you might even find yourself the target of the legal action.