I had never heard of Puff-Lon until Huey mentioned using it in .25-20 below. It looks very interesting. I think I will give some a try. If nothing else it seems like a good solution for reduced loads which I’ve been thinking a lot about since ordering the Howdah in .500LB. If there’s some added benefit of lubrication and substituting for a gas check, even better. Curious if anyone else has any experience with Puff-Lon?