I was shooting my model 10-8 revolver today using Fiocchi fmj ammo. I noticed every so often I would feel burning powder on my left hand and once to my left cheek. When I was getting ready to clean it I checked the cone and After Making Sure It Was Unloaded I held the gun up, held an LED light down the barrel and cycled the cylinder. I couldn't see anything unusual, it doesn't do this every time just once in a while. Is this a concern?