Originally Posted by North East Redneck
I do seal the muzzles with a wrap of electrical tape in nasty weather. Is this needed? Most likely not, but it makes me feel better.
I also seal the muzzle during the winter deer season. If snow or water drips into the bore and it turns to ice then that can cause an obstruction which can blow the barrel. At least that's what happens to centerfire rifles.
Plus the seal protects the bore from getting filled with snow or mud if taking a spill while hunting, and from condensation and/or water seeping past the projectile and contaminating the powder.
Necessary or not, sealing the bore does makes me feel better too.