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Actually just email Ithica and the choke on my 37 HAS NOT been modified or improved. There exact words were I can shoot steel if it has been modified or improved but they recommend only factory loads.
Hope this helps. I myself am just going to buy a new shotgun and use my Ithica for skeet or fun as it is one of the best guns to shoot.
The general rule of thumb is not to shoot steel through the older shotguns with a full choke.The ones having a modified choke or more open you can shoot steel through.