By about 1891-2, Parker was proofing and patterning all guns with smokeless powder.
See below for a typical patterning tag for a circa 1904 12ga, calling for 1 1/8oz at 3 dre load ( 37 grains). The diagonal red wording calls for smokeless ( nitro) powder.
If I did not feel comfortable shooting the original patterning load in a particular gun, I would not own it.
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