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I'm curious about the magnitude of pressure wave built up ahead of the fired bullet. Water is dense enough that I'd be concerned about exceeding the barrel pressure design limit.
Second curiosity is whether the powder would burn as powerfully as in air. I know the cartridge is generally sealed and so it should ignite if the primer is struck. But it is possible that atmosphere (oxygen) just ahead of the cartridge contributes to gunpowder burn, especially in long-burn-duration rifle cartridges (versus pistol).
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