One reason I've heard for the development of water-cooled machine guns is because many of the early smokeless powders burned VERY hot and, if not properly cooled, could wash out a barrel in very short order.
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"The gift which I am sending you is called a dog, and is in fact the most precious and valuable possession of mankind" -Theodorus Gaza
Baby Jesus cries when the fat redneck doesn't have military-grade firepower.
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