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I did talk to a few gunsmiths that have rechambered these rifles to 450 NE 3 1/4 inch and 450 NE #2 in the past, niether would reregulate the rifle if new round was not accurate due to the way Pedersoli silver solders thier barrels

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Hi sharpes and welcome.
I've never handled or examined a Pedersoli but I have re-regulated doubles that have silver soldered barrels.
It can be done on some rifles, but I would need to get a look at a Pedersoli and see how the barrels are put together to know if I could do it.

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