Dear M TEC and Daschnoz,
Thanks Daschnoz. Your info is a very big help. Seems you are the only expert who has done this in real life.
M TEC. One of my fence is 500 meter Long and broad. Adyacent is another fence with another 500 meters Long and broad. And continue so 4 times more. So sometimes there are wild hogs in any of the fences. I do not want go grab my vehicle, start it and drive through 3 or 4 doors (cattle fence doors. Open Close, open Close, open Close, open Close, etc) in order to get the shot. As well we have a high water tank from which I very well would be able to set up an "snipers nest" and shoot anything from there a few miles (3 to 4 Kilometers) away. I am sure somebody will suggest to me a 50 BMG Armalite caliber rifle. So there you go. It is almost free land and you can see a few Kilometers without disturbance.