I have a large enough "backyard" that I want to build a 100 yard Rifle Range.....I already have a pretty good idea of just how I want my Range Shack...(I plan to have it off the Back Door of the Shop)...But my Question is How should One build a Proper Backstop?? I would Appreciate answers only from those Who have Built their own.......I Need Real Experiences Here, not speculation...or Something from a Book. ....Thanks in Advance!!!