Thread: My 22 somehow got a bulge in the barrel.

Just found my trusty JW15 22 somehow has a bulge about 100mm from the end of the barrel. Was shooting like crap over the last 2 days so I thought I'd give it a full on clean at home, I felt it when I was running a rod through and looking down the outside of the barrel there is a definite shoulder like some ones used a plumbers tool. Not sure how it got there, I run a snake through before and after shooting but I suspect it may have been the crap ammo I was using up. I did have a squib shot but checked the barrel to see if it was clear before carrying on. Any one had this happen?
Looks like the barrel's going to have to get the chop and hopefully it will still shoot ok.