Take or send your gun to a competant gunsmith who knows about double guns not someone who specializes in 870's. If you don't know of such a smith tell us where you live and one can be recomended.
Have the chambers measured (there probably 2 1/2 or maybe 2 9/16), have the bore diameter checked to be sure it hasn't been honed, have the wall thickness measured. All this is in addition to makeing sure your gun is tight on face and the overall condition is safe.
Your gun is over 100 years old she deserves to be treated correctly.
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