ScottG had some very good ideas for backstops. Old tires can be acquired for free, the bench can be made from 2x 6's for about $50, and you can use concrete for a pad under the bench or even for a bench top for added stability, if desired. I have two 100 yd. ranges and one 50 yd. range for handguns. on my property in NY. The only law governing a private range is the distance of 500' to a house, farm, or other inhabited dwelling (unless you have the permission of a closer neighbor) The bullet cannot pass over a road (obvious). Than being said, I have 17 acres of woodland and feel this is about the minimum without a commercial-type backstop, since the longest leg of my property is only 1100'. My backstop is a natural burm and my lot is heavily wooded. My targets are close to the ground also. My target holders are made from scrap wood and replaced often. There is still a liability involved however, because even posting your land will not relieve you of the liability you will incur by accidentally shooting a trespasser!