Do a search in the reloading section. There was a thread on bullet traps. A guy in Florida made a really nice one who lives on a farm. It was movable and not only stopped the bullets but then the fell down in the bottom to be recycled. I can not remember when the thread was but there was several other ones that worked very well. Some were filled with the shredded rubber mulch and would stop pretty much any bullet.

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Still Running Against the Wind