From the Parker site:
12g Parker SN 71792 c. 1891 was patterned with 1 1/4 oz. No. 7 and 42 grains DuPont. A 1900 Parker hang tag states that 12g 2 5/8 chambered guns were patterned at 40 yds. in a 30 circle using 2 3/4 shells with 1 1/8 oz. No. 7 chilled shot and 40 grains (3 1/4 Dram) of DuPont Bulk Smokeless powder. (Courtesy of Bruce Day)