I just measured with a micrometer, and my wedding ring has developed an eccentricity of 0.3303 (24.4mm x 23.03mm). Which is rather odd, because I always take it off when I'm doing the kind of things that would tend to crush small loops of soft metal.
no subject
If you want, fish, I have a ring mandrel and a couple leather/wooden/rubber hammers, very nice for rerounding rings without changing their size.