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Receiver strength is not much of an issue as 2-3/4in and 3in 12ga shot shells operate at the same pressure limit: 11,500psi. Three inch shells just hold more shot. 3-1/2in operate at a higher pressure. First try to cycle 3in in your gun. They will go into a 2-3/4 chamber, but don't fire them. If your barrel is thick enough around the forcing cone area, a gunsmith can ream it out to a 3in chamber. If not, just get a replacement barrel. Or just get into shotshell reloading and you'll find 3in doesn't have much advantage over 2-3/4.
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