Till 1926. Your gun has likely never seen black powder. It was designed for the new smokeless powders that were gaining popularity by 1889. Trap meets were requiring use of smokeless powder starting in the 1890's. Your gun would have been patterned by Parker with 3 dram equivalent of dense smokeless powder and 1 1/8 oz of shot at about 1180 fps.
From a Parker catalog in the approximate year your gun was made. Nitro powder is smokeless powder. I don't know why a person would shoot black powder through a Parker unless they wanted nostalgia or smoke effect for some reason .
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