If you're wanting to make shots at 2000 yards, better get yourself a .50 cal mod deuce or something automatic. Or better yet, hire a helicopter gunship to fly around your property!
2k is a looooong ways away.
I've shot M240 out as far as 2200m at moving truck targets, pretty ineffective even with a machine gun. But 1000yds/meters whatever, you could do pretty well with .308 with some training/skill.
maybe you could build yourself a home made predator drone