The load a gun is targetted with and the proof load are two totally different things.
There are a couple of sets of hang-tags shown on page 520 of The Parker Story. They show that serial number 108998, a 7 pound 10 ounce, 30-inch barrel, 12-gauge, was targetted with a load of 1 1/4 ounce of #7 1/2 chilled shot, pushed by 40 grains of DuPont powder, putting 325 pellets in a 30-inch circle at 40 yards from either barrel. A load of 1 1/4 ounce of #7 1/2 chilled shot should contain about 431 pellets. 325/431 = 75.4% or pretty damn tight!!
The hang-tag for serial number 211738, a six pound, 26-inch barrel 20-gauge shows the gun made for 2 1/2 inch shells and it was targetted with a load of 2 1/4 drams of Bulk Smokeless Powder pushing 7/8 ounce of #8 chilled shot, putting 100 pellets from the right barrel and 150 pellets from the left barrel in a 30-inch circle at 40 yards. A 7/8 ounce load of #8 chilled contains about 358 pellets
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