Thanks Rick, I figured it out though. It comes down to me being an idiot. The 10ga barrels are also 2 inches longer than the 12s.
Knowing that it became quite obvious that the 10 had a wider rim in the breech and the brass of the 12 shell doesn't completely cover it like it does in the 12s.
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"The Parker gun was the first and the greatest ever." Theophilus Nash Buckingham
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