What make and model of gun did they use? It might be that a Mossberg with a thick, sewer pipe barrel would survive a 12/20 burst or a blocked muzzle. The same can't necessarily be said for a thinner, contoured barrel such as would be on a light sxs.Mythbusters did the 20 gauge down the barrel and then fire a 12 gauge and nothing blew up. They also plugged a barrel full of mud and nothing blew up.
The only thing Mythbusters proved was that it didn't happen in the specific gun they used. That cannot then be applied to every gun out there.
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