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Old August 7th, 2009, 19:01   #8
m102404's Avatar
Join Date: Apr 2006
Location: Toronto
Take a big-ish cardboard box. Stuff it with crumpled up bags, newspaper, rags, etc... Loose stuff, nothing hard that the BBs will bounce off of.

Put the whole thing in a big garbage bag (this helps trap stuff as the box/stuffing gets blasted).

Tape a regular sheet of standard letter paper onto it. Use marker/ put dots/circles/etc... on it.

(hold an old CD on the paper and either fill the center hole with marker or a light shot of spray paint....makes perfect basement sized dots real quick)
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