This is a discussion on Firing ammo submerged in water test within the General Firearm Discussion forums, part of the Related Topics category; Just out of curiosity about the quality of my reloads, I took 4 rounds of the same revolver caliber, 2 factory, and 2 reloads and ...
Just out of curiosity about the quality of my reloads, I took 4 rounds of the same revolver caliber, 2 factory, and 2 reloads and dropped them in a glass of water for 15 minutes. They all fired with no issues. I just wanted to test this for my own peace of mind, although I don't plan on swimming with my guns. I did not use in laquer sealent on my reloads. Just wanted to share for those of you who may wonder about such things. Maybe I think too much......
You don't think too much at all... actually, go a little further.
Try the same test with a little wrinkle: Put a at least 3 rounds of each type out on a dark cloth in the sun for a good hour. With any luck they'll reach at least 100F. At the end of the hour, dunk them in a glass of water at refrigerator temp (about 40F). Put the glass with submerged rounds in the 'fridge for at least an hour... THEN try to shoot 'em.
The difference here is that the temp change in the presence of humidity will pull negative pressure inside the cartridge case and, unlike in your first test, will actually try to draw moisture into the cartridge case. This will be a much more revealing test than a simple dunk at constant temperature. This would be a very conservative simulation of getting dunked in a mountain stream on a hot day in the mountains.
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NROI Chief Range Officer