Loc: Athens, TN, USA
I can see the use of sealant on a shotgun shell for duck hunting in and around lots of water in all kinds of weather or military rounds under field conditions. I never have used any though in my hunting rifles and I hunt in all weather conditions and have never had a problem. Most rifle breeches seal tight enough for no problem unless you just dunked it in a puddle. I would worry more about an accumulation of the varnish from the sealant getting in the firing pin mechanism over long term use. Never used it though so I don't know if that is so or not.
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