It is well to keep in mind that the "proof safety" of any gun barrel is only valid at the factory, and for as long as the subject barrel remains unaltered.
Within the decades that many of double guns we admire have existed, they have stood liable to a panoply of factors that can negate proof. Parker, British, or otherwise. Most of these factors involve a host of bodgers who may have attacked the barrel with various implements over the years. To shorten, open, hone, lengthen chambers or otherwise alter the barrel to a less than safe condition. Especially with the use of certain ammunition.
Thus, most if not all classic doubles should be assessed by a professional and competent double gunsmith before any verdict is rendered as to their safety and suitability for shooting today.
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