There is no way in hades can you justify 600-800 yards as self defense anywhere in this country.
No where in this country is deadly force condoned for trespassing.
If something was to happen, you can bet both in civil and criminal proceedings this "Ruger American Rifle, sniper" post will some how show up at trial.
Just thought I'd get this in before the close.
CPT USAR Ret
USAMU Sniper School Oct '78
Distinguished Rifle Badge 1071