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even at 300 fps, the BB is going to go where it wants within about 30 feet. I had a trap for 320-340ish fps and bbs would hit and come out almost all the time. You need a big box to catch everything and a target recessed into that box... and your box needs to be strong enough that the BBs won't eventually get through. even 4 or 5 layers of cardboard box won't be enough. Don't use wood either... I'm learning about that one in my chrono box. :P
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