From the article:
Quote:
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So, back to a very useful tip on shotgun shells. It's called "cut shells" and what it does is effectively turns the standard number eight shot dove load into a devastating 70mm Glaser type slug.
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Not exactly 70mm, that would be nearly twice the diameter of the M203 grenade launcher round.
The video has it correct: "seventy caliber"
A 12 gauge is 0.729" inches in diameter, so it would be fair to call it a "73 cal"