Normally, Parker Bros. guns up to about 1893 were made considerably overbore, for use with black powder loaded brass shells with one gauge larger wads. My 1889 vintage 12-gauge GH-Grade is .757". If one attempts to measure (?) the chokes of these earlier guns with a plug type choke gauge they will look cylinder at least. On the other hand, my Grandfather's 1890 vintage heavy 30-inch barrel PH-Grade, when I got a letter on it from Ron Kirby, was ordered cylinder and cylinder, I suspect for shooting pumpkin balls.
Once smokeless powders for and paper shotshells began taking hold in the early 1890s, Parker Bros. began to bore true to gauge.
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