It is either rim or firing pin. As Richard says, see how the rim fits the extractor groove. My BHE hates Winchester, and loves RST (Figures; Winchesters at $64 a flat, RST at $110/flat) RST use steel primers, and Winchesters are either copper or copper plated, but definitely softer. It's only the Left barrel, and I just need to get it apart, see that it's isn't gummed, restricting the rebounding action, or that the firing pin isn't pitted, needing honing. Protrusion is good, so it's likely the two reasons for me. I know it's not rim swell, as the gun will be locked tight, and then as soon as it's freed up, opens with no drag.
Take a look at the indentation in each fired shell to determine if one is deeper than the other.
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