A Little Off Target Here
G. Willikers mentioned the ground up rubber.
For my backstop I have found that cutting the tread off of tires and screwing it to a piece of 3/4 inch plywood works wonders at stopping a bullet from a handgun. Right now I only have two layers of tread and it stops most handgun bullets.
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Inside Every Bright Idea Is The 50% Probability Of A Disaster Waiting To Happen.
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