People do it. I don't. In an auto, it's a strange practice. In a revolver, it might make some sense. I would tend to carry two handguns loaded differently and appropriately if I felt the need for that kind of diversity. Ever been in snake country looking to kill some snakes, and can't find a snake anywhere. Happens to me all the time. Life tends to be full of surprises that you can't ever anticipate.

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Dr. B