Hi everyone, I bought this gun new in 2012. I shot it a few times and put it in my safe. I got it out today to shoot and noticed that the barrel is bulged/tapered. It’s not just one bulge. The end of the barrel about 3 and 1/2 inches back from the muzzle is tapered out, and uniform all the way around the barrel as best I can tell. Is this normal or is something wrong. I only shot a few #4 buckshot, and my choke has 4 dots( improved cylinder. Thank you for your time