Not sure when Ithaca went to modern steels I wouldn't risk a fine old double a single may be less affected. If you are doing your own loading Ballistic Research used to cut mylar wraps for large size steel loads. These and a buffer like Grex would help some. If you can't get a definitive answer then I might try one and check before and after with a bore scope for scoring and measure for expansion. Light scoring can be removed with polishing. A belled choke would most likely need to be replaced with a tube.

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