New to shooting a flintlock. I have a Lyman Great Plains 50 cal and having problems keeping the powder in the priming pan. The frizzen looks like it closes tight and I can't figure out where the powder is falling out. I'm finding out that you can't sling it, lay it down on its side and I have to try to keep it up right all the time. You old time shooters got any advice on how to keep the powder in the pan?