Classic ball powder and using a standard primer. Switch to a mag primer or switch your powder. If you would have pulled that round apart, the powder would have came out in large clumps. Then someone would have said that the powder was contaminated. What happens is the primer barley ignites the powder. It ends up burning the graphite off of the powder and not the whole powder itself. This turns the powder to a greenish color and clumps. This can also lead to a detonation. The powder detonates instead of burning. Then you may be wearing the gun on your face.