Longer shotgun chamber

[SuperCub]

Can a chamber in a modern SxS or O/U be lengthened from 2.75" to 3"?

If so, how much would that cost?





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[guntech]

If the barrels are not chrome lined it is fairly easy to do. If the barrels are chrome lined it requires a carbide reamer.

 

[John Y Cannuck]

Take the gun in question to a gunsmith and ask, depending on chamber wall thickness, it shouldn't be a problem.
I had a Remington Model 10 lengthenned from 2.5 to 2.75 a few years back, and have no problems as long as the loaded round isn't too long for the action to handle. Most work fine.
In a single shot, or double, you would of course not have any issues from the action length, so it should be easy.