Out here in the people's republic of California, where a hot look from a beautiful woman can burn down half the state in the hot, dry, summer, the very first thing I check when testing patching, lubes, or wadding, is it ability to hold a spark, and set a fire. I have never had hornets nest, or paper wasp nest hold a spark. I will admit that I have only harvested one traditional hornets nest for this purpose, since they aren't as common here as the wasps that build their little nests in the corner of houses, and barns. I found that wasp nest tends to blow apart into small fragments, and don't have a piece with enough mass to blow your shot pattern.
Hungry Horse