The hardness of shot has a lot to do with pressure just as changing wads can change pressure. Everything is a spring (Young's Modulas) but some things less so.
Bismuth and Nice Shot are harder than lead and usually raise peak pressure. ITX is definately harder than Nice Shot and raises pressure even more, all else being equal. Steel and Hevi Shot are harder than ITX and...
BPI and Reloading Specialities make 10 gauge wads with steel being their intended payload. BPI provides loading data for 10 gauge wiht ITX and their wads. I have only found one BPI load like this for the short ten.
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