I had a friend of mine, many years ago, that decided that a 14" heavy barrel .44 magnum Thompson Center Contender would be a fun gun to experiment with. So he re-chambered it to .444 Marlin. After the first round, it was back to the shop to port the barrel. Even then it was an unruly beast! And yes, I did touch off one round, and believe me that was enough to last me a lifetime!