Probably reult of an iiot shooting steel. Had a 10 ga. Matador with the same problem, though it didn't appear to disrupt patterns Chops
Back in 2000 I had a 311 with a slight ring bulge right at the muzzle, however it was bulged more on the outside than between the barrels. When I patterned it the ring bulged barrel did shoot about 8's left of center. However, I don't know how it shot before the ring bulge. The gun may have been out of regulation to begin with. I took the gun back to the Scheels Coralville IA store where I purchased it. They cheerfully refunded my money and promptly put the gun back up for sale.
Steve
