why not just call the sheriff and ask for permission to shoot on your property
Why not just shoot and stop begging permission for things?
I live S of Hillsboro and hear more shooting here than I did in Wyoming. I shoot in the gully behind my house. On the other side of the gully is another house with a new neighbor, who (it turned out) was uncomfortable with the shooting - the wife was, anyway. She contacted me about it, said it bothered her. Instead of doing my usual thing, like I would have when I was younger, of telling her to mind her own business, or that I can do what I please on my property, and so forth, we talked about it for a while. I offered to call her when I wanted to shoot, and wait on that until she was away from home. In other words I tried to accommodate her. Finally she said something like, "Oh, never mind, just go shoot when you want to!"
Moral of the story, get along with your neighbors, they won't give you grief no matter what the silly (and unconstitutional) laws say about it. Although even legally I believe as long as you are outside the UGB you are good to go.
I recall some years back there was some pressure in Washington County (Oregon) to restrict shooting outside the UGB too, by the hoplophobes, but the county commissioners were not having a bit of it - even the liberal Democrats.