A 3 shell easily drops into the 2 3/4″ chamber of my shotgun. Would it be unsafe or unwise to shoot them and why?
Yes, it would be unsafe and very unwise to shoot 3″ shells. They drop in because all shotgun shells are measured after the crimp has opened. Once fired and straightened out, a 3″ shell will extend into the forcing cone of a 2 3/4″ chamber, dramatically raising pressure. You do not need 3″ shells to accomplish any purpose for which your gun was designed or is suitable.
