Thank you for the response. I didn't see any burrs or deformities that I can tell but will scrub it and check again. The chamber accepts 5 different shells I have tried fully. It looks like the bolt head is rotating. moving backwards, too early and it won't go past the point in the picture. It only happens with a shell being loaded. I have reached out to Breda but I am not the original owner so not sure how much help they will provide. Will probably need to find a gunsmith because I am kind of lost at this point. Was hoping it was just something I was doing wrong.