In short, it depends on what bullet and how many sheets you are willing to unroll.
Matt with Demolition Ranch does the work by rigging up a contraption to allow him to wind a de-boxed roll of Reynolds around a block holding one regulation-sized watermelon. Starting with .22LR against two boxes of leftover cover-up, it is really no contest but he steps it up from there.
It gets kinda silly. Like 700 yards of foil silly.
But does it matter? After all, it is aluminum foil.
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