If new shells work OK, your collet is not tight enough. I had one Model 42 Winchester that would not take MEC loaded shells, no matter what I did to the collet. I went to the PW 800B that sizes shells in a full length sizer and had no further problems. I wouldn't mess with the chambers if they will take new shells. A good resizer should bring your shells back to new dimensions. Keep the new shells you shoot in this gun separate when you load. That may solve the problem.
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