Graphite is it is a dry powder. So it does turn gummie when it is exposed to moisture.
Heres the problem. You shoot a lock with graphite, it returns to normal operation for awhile. Starts to get stubborn again. Common sense says "well that didnt work, lets try something new. You shoot aerosol lube in there. It might return to operation for a little while until the liquid evaporates and then your left with something the equivalent of a glue ball in a lock.
Putting graphite into a lock that is pregreased from the factory is even more of a headache.
If you lived in the Sarah Desert, yes, power graphite would probably suit your needs better because liquids will evaporate very quickly relatively speaking. However, for the rest of the world, graphite is generally not the way to go.
Houdini Lock lube is my best friend:
http://www.omahawh.com/ProductInfo.aspx ... PI%2011101
I use it on all my locks and everywhere else. It is my duct tape of the lube world. I also spay my tools with it to keep them from rusting. Plus it smells like citrus something or another. Very pleasant smell.
Well thats my two cents.