yeoman
Powder compacts... even when I pull the breech plug on a rifle I can not get the powder to pour out....
When I was doing those experiments - I brought the rifle into an unheated garage for a couple of hours before coming in the house... The one pic I saw of your gun you had a scope on it - check and see if a fog layer forms on the scope when you come in - it is even more sensitive than the barrel. Do you cover your muzzle? when in the cold, wet, damp weather? If your gun has the deep lands and grooves that doesn't help either.
Just throwing out thoughts - not that any of them will help... I think cayugad said it best - if in doubt get it out...
So, now do you think Goex would solve that under the Pyrodex?
That I am not sure of because I have never duplexed any loads.
Another thought that just jumped up from the depths... When i put Pyro in water it wen imediately to a black sludge - when I dropped T7 in water it retained it's shape and the water did not turn black... is it coated with something - I do not know... and do not get me wrong the T7 was ruined but it did not go to sluged until you stirred it...