Probably nothing wrong with it as long as it's been stored well.
If it says Mk VII or Mk 7, or just VII, or 7 then it is both cordite & corrosive. All non cordite was marked as Mk7z.
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Allan Quatermain: “Automatic rifles. Who in God's name has automatic rifles”?
Elderly Hunter: “That's dashed unsporting. Probably Belgium.”
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