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My current 7.62x54R (Russian rimmed) mil-surplus cartridges are steel and lacquered to resist moisture. Some calibers (not enough taper) and weapons (tight chambers) should not use lacquer because they may jam in the chamber after firing. A typical example is 223 Remington, where Wolf brand decided to stop lacquer coating that cartridge.
No idea how well that lacquer seal would hold up in deep water.
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