I noticed something curious at my range while shooting my muzzleloader. I have a T/C Hawken with an after market Green Mountain roundball barrel in 54 cal on it. I bought the barrel a few months ago and have run 50-75 shots through it. I'm shooting .530 balls and TOTW precut pillow tick patches lubed with bore butter over 80 gr Pyrodex P. The last 2 times I had it at the range, accuracy with this combo was outstanding. Yesterday, I shot 3 shots at 50 yds, went to inspect and was surprised to see a 4-5 in group. I chalked it up to human error and walked back to the bench. On the way back, I found the patches had shot and they were shredded badly. I haven't seen that before. Anyway, I shot 10 or so rounds and accuracy was not what it could be. several patches did not shred but must did (that I could find). I have on past trips inspected the patches that I could find and I never found a shredded one, Most were frayed around the edge but I don't care about that. When I cleaned it last night, the cotton cleaning patch that I pushed the soapy water back and forth through the barrel had several holes in it. It looks to me like the lands are cutting the patches now and cut the cleaning patch.I haven't noticed this before either. I know this is a fairly new barrel, but I would have thought that if the lands are too sharp, they would have cut the patches from the start. I place a dry patch behind the lubed patched ball over the powder because I did that with another 54 cal I had and it worked well. I have ordered some supposed linen from the internet, it's purported to be flax from Europe, in hopes that it will be tougher. Anybody know what could have happened?