I've owned a TC Hawken since the 70s. I had my problems at first, but always it turned out to be self inflicted. Moisture, not cleaning properly where my failures. No matter what the weather the barrel is taped. Plastic over the nipple. Held down with a rubberband. The gun never comes in the house. Locked in the truck or garage. When removing the cap at the end of the day the plastic is put back over the nipple. Then the hammer is let forward to give pressure on the nipple so no moisture can enter.
9 buck, 1 doe, 1 bull moose and no problems All taken in Maine and New Hampshire with the cold/wet conditions.