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I'd hope for reasonable accuracy, say a 12 inch circular steel target at say 10 yards. With both barrels. Hopefully better but ...

Now to source a suitable hammer donor shotgun. Barrel inserts of some description and suitable calibre/bore.

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I would think thats possible, either with shims or by grinding at the muzzle....

As I recall Sabatti regulates their DRs by "grinding" the rifiling at the muzzle. I had a 9.3x74R Sabatti that shot fine. I never noticed anything unusual