In reply to:

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Do you think perhaps that it could be manufacture specific?

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8X56,
You could be right.
That Tikka is a big 12 gauge frame and the little 9.3 barrels end up being spaced a LONG way apart.
Also the Tikka barrels lack rigidity and have little or no heat transfer from one barrel to the other due to the fact that there are no ribs attached.
This is not the right way to design or construct double rifle barrels IMO.

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