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food gloves or any stretchy glove. Cut the thumbs off as short or long as needed and they work great.
I would be concerned that if they aren't really tight and you carry your weapon muzzy down in wet weather that you will be doing yourself more harm than good. I can see rain running down the barrel. Pooling in the cover and then dumping a bunch of water down your barrel when you raise it up or sling it over your sholder.I think I'll stick with a naked barrel. Like I said, been hunting muzzies for 20 plus years on the wetside in some torrential down pours and have never had an issue with my powder getting wet.