I'm planning on joining a range eventually, but I have some room here out in the country. I'm wondering how much of a thickness of dirt or sand it would take to stop a bullet? I shoot 9mm, .38, .357, .45, 5.56, and soon to be shooting 7.62x39. From my patio to the edge of my property (the cornfield) where I'd put this backstop is 45 yards. If you think that a reasonable backstop can't be built for my bushmaster or saiga for a 45 yard shot, then just limit your response to the pistol calibers. I've got 125 8 inch concrete blocks left over from a remodeling project. No one wants to buy them because the labor in loading them is more than they're worth. I was thinking about laying up a wall in a U shape, wider parallel to me with shorter wing walls facing me. Slushing the block cavities with quickrete. Then containing the dirt or sand in there some way and putting my target stand in front of that. Of course if you think that this is just an idiot idea I came up with while sitting here bored on a bad weather Saturday and there's no way it would work, feel free to say that too.