I recently traded with a guy for a Thompson Center Contender with the TC scope and a 14 inch bull barrel. The top of the barrel is marked 44 remington magnum. On the side of the barrel, someone punched .444. The previous owner never shot the gun and bought it from a guy who had it for years and I can't find him. The gun was sold to me as a 44 magnum. What is the easiest way for me to tell if the barrel was rechambered for the .444 marlin round? Is it safe to shoot 44 magnum rounds in it if it has been rechambered. You would think I should know this but I am not that familiar with 44 magnums or 444 marlins so you will have to forgive my ignorance.