Storage and age, does make a difference on performance. I have also had problems with older pellets. With age, they have a tendancy to burn like solid rocket fuel. Kind of neat how they fly and burn, going down range but this is not what I'm looking for. Just another reason for me to go to loose powder. A few years back, I contacted Hodgdon to inquire about shelf life of 777. They never replied. In my book, there is no such thing as an easy cleaning or perfect M/L propellant. To date, all are suspect but some are bettter than others. However, to be fair, I have not tried Blackhorn-209. ...
I have often wondered if these pellets could be regenerated by drying in a warm, dry enviroment. .....
Be Safe !!!