Well I have experienced this with more than one jug of Pyrodex. I live in Colorado and it is very dry here and have never had a problem with moisture, yet! I'm not saying moisture isn't the problem, I've just never experienced any thing like that in the last year. I know that the same jug of Pyrodex goes off just fine in my CVA Kodiak inline. Of course with a 209 primer what wouldn't go off.

I may take your suggestion with the paper and see what I find. I may even try a new nipple. Heck it never hurts. Thanks for the tips.