We drive vehicles down to the target berms. And when I said "pasture" I meant it. It's literally a cow pasture with.... cows roaming around. Amongst all the other important things I've learned about (long range) shooting in the last year is cow herding/wrangling with my Excursion. The cows occasionally wander in front of the target berms so we go 'cold' and send 1 or 2 vehicles to "round 'em up and send them on their way". One time there were several horses out in the pasture. The horses were a much bigger problem because: #1) Horses spook. The cows never bat an eyelid even when firing large caliber rounds 50 yds away from them. #2) The horses have been known to gallop across the target berm, whereas the cows never go anywhere in a hurry.
http://www.youtube.com/watch?v=z9d8axet2Vs