I know: "How does he do that?". I weight the ammo before testing and again after testing.
Placing a vacuum on the ammo creates a vacuum inside the case if the case is leaking, dropping the vacuum on the pot allows the vacuum to pull water into the case through the leak.
I am the fan of finding the leak before I jump in, think about it; you pull the trigger and there is no bang. When that happens you have to start loading your ammo without powder/primers and mixing the duds with functional ammo, primers etc. You want to avoid 'the flinch' when the ammo does not go bang.
F. Guffey
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