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If Fraser rebarreled it, they stamped it with the same number as the action. That is the origin of my question about the existance of a BP cartridge of similar dimensions to the 400/360 because this barrel isn't nitro proofed.
Afaik the markings for Nitro proof were introduced by the British proofhouses in 1904, several years after NE cartridges came into use. So any gun using Nitro Express cartridges made up to that year will show only the old black powder marks, though it is intended for cordite.
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