Carburetor cleaner? I'll have to try that. I recommend that, before loading, one cleans the oil out of the powder reservoir. It probably doesn't make much difference at the range, but in a hunting situation it's different. I went out with my boy earlier last month, ostensibly looking for a deer. I carried the GPR, and we were out most of the day. When I got back to the truck I tried shooting the charge out. There was a fizzling in the pan, not even a real flash, and nothing. I picked the vent, recharged the pan and tried again. This time I had a nice flash, but still no bang. I followed this process twice more before she went off. I believe the oil in the reservoir had contaminated the powder charge over time, as I have never had this happen before. Glad I didn't see the buck of a lifetime!
-WH-