The load recommendations are from the Parker Small Bore Shot Gun brochure, pp 9, 11. Mine is about a 1915 publication.
I am aware of the 1 oz 20ga loads made by manufacturers in the 1930's but I have found no mention that Parker ever recommended them. Even in the long or magnum 20ga loads in a Parker, I believe those were still 7/8 oz. I don't know what those uncommon Parker 1 frame 20's are intended to shoot.
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