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Say I have a SxS shotgun that that shoots rifled slugs accurately from both barrels at say 40-50 yards. What accuracy would one expect from the same gun with rifled sleeves inserted into the barrels? I don’t know if this would be like comparing apples to apples or not. I would like to find. (or make) some .577 BPE barrel tubes or sleeves. I don’t want to go the rifle building route at this point in my life, but this sounds like a great experiment or project.

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Do you actually have a shotgun that shoots rifled slugs accurately from both barrels, or is this part of the hypothetical question too?
A German friend of mine had a 20G SXS made in Ferlach specifically regulated for slugs, but I suggest most factory made shotguns are not regulated for shooting slugs, they are set up to pattern shot from both barrels to a similar POA, the POA not so critical for shot patterns as it would be for slugs.

If indeed you do already have a shotgun that regulates satisfactorily with slugs then the same gun sleeved to 577 BPE is not guaranteed to achieve the same regulation as a matter of course, it would almost certainly need to be specifically regulated.

In reality a BPE conversion would not gain much over the better 12G slugs available today, depending of course on what slugs do regulate in the 12G SxS. Anyone coming across a double shotgun that regulates with good slugs has a goldmine and I would keep it that way.

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