Taz that is a good question I'm still alittle concerned about useing metal though, even with the metal angled the bullets are still going to pit the metal. Once the metal is pitted the bullet could hit and go anywhere????(not sure just a thought)... I'm also building an outdoor range I'm going to make a mound of dirt at about 100 yards out then I can set up any type of target I want in front. I have lots of room to do this I'm not sure how much property your working with? The box Idea is a good one you could also use dirt instead of news paper. I hope someone can help more then I have I just get concerned when someone shoots metal targets that close.