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In shallow water the casing (from what I've read) is water proof enough that the propellant never gets wet. In deeper water the question arises: will the case remain water tight?
If so (if the water is kept out), is the case strong enough to withstand the even external pressure of 450psi or might it collapse, and if it collapses what might be the result? Another question that occurs is whether the primer is weaker than the casing, and so might collapse first and fire the charge early?
If not (if water gets in), is water inside the case likely to cause problems with ignition? As I understand it modern propellants won't care about the water if you can ignite it, but it seems feasible that ignition from the primer could be an issue - but I don't know enough about it to be sure.
I think (mostly from what I've read) that most of the instances of guns failing under water has more to do with water interfering with the feed mechanisms (ejection and/or loading) than with the bullets themselves. I haven't watched that many of the videos, only have limited download and relatively slow connection here.
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