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I'm certainly not suggesting firing a rifle with the foam still in the nipple(!) - the foam is just an easily removed way of sealing the nipple when there's not a cap on it - so it makes no difference what kind of powder is being used. If some foam gets stuck in the nipple and can't be removed with tweezers or a toothpick, nipples aren't hard to remove, and the foam can easily be pushed out of the nipple from either end. You would never want to push so much foam into the nipple that it gets into the fire channel - just enough to fill the outer part of the nipple.Good info, yet personally I would suggest never stuffing anything into a nipple orifice, and all the moreso with Pyrodex, which is harder to ignite than black powder. Better, if using closed cell foam (assuming you know what that is) would be to put a a piece of it into the cup of the hammer, then let the hammer down on the nipple. You can then use a safety pin, tweezers or whatever to remove this piece from the hammer cup when applying a new cap.
Aloha, Ka'imiloa
Good suggestion about using closed cell sheet foam between hammer and nipple for sealing the fire channel - that would work as well as a rubber band or a piece of an inner tube. Regardless of how you're using foam to seal the nipple, you do have to make sure it's closed cell foam, as open cell foam allows air to pass through it. How to tell open cell from closed cell foam? Open cell foam takes up water, just like a sponge. I'm a fly tyer, so I have lots of closed cell foam of different sizes and shapes.
For octagonal barrels electrical tape probably works better than the Traditions "Raingear" rubbers, which have a tendency to tear on the ridges of the barrel. The rubbers do work on octagonal barrels, but you have to put them on pretty carefully.