The Ithaca SxS in the OP is a Flues Model, made in about the 3rd quarter of 1910.
Please refrain from shooting modern ammo in it, as the steels are not up to it, and can fail w/o warning.
After having a gunsmith measure the chambers with the proper measuring tool, in case they are the older/short chambers (long/unfired shells will chamber in a short chamber) - special, low-powered ammo made for those type guns is commercially available from the likes of RST, PolyWad, etc.
Modern "low brass" ammo & "field" loads do not equate with "low powered".
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