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Most side by sides are built different than other guns. The chamber area is actually a seperate piece of steel that is welded to the barrels. When 2 3/4" guns are the chamber is very near the barrel welds. When extending the length of a chamber, the lengthened chamber can extend past the reciever block and actually extend into the welded on barrels. Not a safe practice. This advise came from a top gunsmith, and former president of the custom gunmakers guild, so I assume it to be correct.
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Most modern sxs and o/u makers use the monobloc barrel making process described above. The barrels are not welded onto the chamber but inserted into the breech, soldered in and then the chamber is cut. The process is also known as sleeving.
Here's a good description of the process.
http://books.google.ca/books?id=nLq3...barrel&f=false
The risk of lengthening a chamber is the same whether monobloc, chopper lump or any other type and that is removing metal where the barrel beings to taper and pressures are high. What matters is how much wall thickness is left after the chamber lengthening is done. Also depending on where you are the gun will be "out of proof" which is not an issue in North America because thare are no proof laws.
Stoegers typically have thick barrels. I doubt lengthening them 1/4" of an inch would reduce the barrels walls below acceptable minimums but would take the final word on the issue from a gunsmith.