Yes I do know a way to make a extremely tough back stop. I havent gotten any thing threw it. Even an arrow at 115 psi wont go through. You get about 30 of the signs I was talking about and glue them together. It is very tough and if the front of it gets to mest up just glue another on front of the bad one. It works great!
I really like ur idea Prof!
Guy think about it... dropping a buck 50 for reusable ammo that is pretty much solid metal isnt all that bad price wise... Seeing that the cannons some of us build are over 100 times that price.
Some even 500 times that
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