Its not a bad idea. I tend to do this in rain and snow. Small piece of sticky tape over the top stops the rain but I sometimes forget to replace it after the shot
Hunting in VIC bush... wet ferns, twiggy branches etc. I'm pretty conscious of keeping my barrel down though or clear or brush when moving through it so nothing can fall in.
Only time I'd check is if I dropped it in water or mud or something which could have run down the muzzle during. Haven't dropped it so far though.
To be sure, to be sure. Its a common practice and seems to have no effect on accuracy. The air in front of the projectile blows the hole in the tape. Rubbish in the barrel is a damage and safety issue.
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I expect the air pressure from the approaching bullet would remove the tape pretty much immediately.
I wonder if the bullet even hits it actually... Just thinking out loud there.
I can't see it having any effect at all for hunting.
Just to be clear though... I'm strictly speaking of tap outsize the barrel. By the time the projectile hits the tape it's clear of the barrel so can't be jammed by it. A barrel obstruction is a serious concern though. Anything finding it's way inside the barrel - even just a little - I would not fire with.