Good friend's father has one of those Savage .410s. He uses it to keep rabbits out of the garden, and last winter shot a neighbor's Rottweiler with it. Dog tried to bite him, he got inside, got the shotgun, and when he went back out to make certain his wife was not in danger, the dog tried to bite him again. Boom.
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Beware the man with the S&W .357 Mag.
Chances are he knows how to use it.