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I've used water soaked ( and i mean soaked) yellow pages books before. works well for comparasion of bullet performance.
There was an article a _long_ time ago conering ballistic gelatin, in one of the big gun magazines. Can't remembe rit well, but i do remember that the same place that makes jello, at least then, made ballistic gelatin.
I believe they said more info could be found by writing to them, but it was quite awhile ago, and i have selpt since then so i might not be remembering everything completely.
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