I've got a solution for you since you don't like tape and you are still waiting for that bee to go into your barrel...
Get a squeeze bottle of Sue Bee honey from the grocery and put a nice squirt of honey inside the end of your barrel. It'll keep the dirt and rain out of the rest of your barrel. And if you are patient you might be able to kill two or three bees at once. If the bees don't show, you might want to suck the honey out before you take your next shot. LOL
This could give new meaning to to term "a real sweet shooter".
(Disclaimer: Kids, don't try any of this at home, really).
Nifty-250
"If you don't know where you're going, you may wind up somewhere else". Yogi Berra
