Brian,
Old forcing cones were about a half inch long. Modern forcing cones are longer to reduce perceived recoil. Modern cones are typically 1 3/4" to 3 1/4".
If the old Fox has long chambers and short cones then while they may not be original, they are likely from long, long ago.
Being a Sterlingworth rather than a graded Fox the long chambers are likely not factory original. Back in the day long chambers were ordered for longer shells with extra wadding for pigeon and trap shooting.
Mark
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