[DUCKGOGETTER]

This may be a stupid question, but my dad asked me and i've never been asked this. He bought a new over and under today and it says 3 inch chamber on it. His question was if he can still shoot 2 3/4 inch shells out of it? I told him i didn't think it would matter, cause the diameter of the shell is the same. Any help would be appreciated.

Thanks, dgg