Was gifted a Cabelas traditional .50 ML. Owner cleaned an put away about 15 years ago. Now the bore is OK but the nipple was frozen in and x@%&*M@!F gunsmith really messed up threads removing it. It only catches by about 1.5 turns and is loose. Is it feasable to ream out and put a 5/16 X 28 nipple in? That is about 1/16 larger then the existing threading. Has anyone done this before? Or better to cut the "rams horn" off and install a drum and nipple? With the bore being OK seems this would be better than 2.5Cs + for a Green Mountain barrel. Any experiences positive or negative along this line? 10ga