The two double guns I sold when steel shot "came in" for ducks and geese" were reamed full choke guns & did not have choke tubes. I do have a modern Mossberg 835 with steel choke tubes and 3 1/2" chambers. It also has an extremely large diameter chamber area, larger than any other pump I've ever seen.
Those 3 1/2" shells look imposing. I have a box in #2 steel, but have never fired the shotgun tube on the gun, only the rifled one. That model Mossberg comes with both.
The 24" rifled tube loves the 2 3/4" Gualandi DGS slugs, 496gr. @ 1,610fps.
It shoots identically with 3" WW 1oz.Fosters at 1,750fps.