All the commonly available factory loaded 1 oz 16ga cartridges I am aware of generate chamber pressures below 10,200, or the design max working load for the gun. 1 1/8 loads are over that to the full current limit of 11,500. It seems implausible that a person would come to shoot targets with 1 1/8 oz 16 ga loads.
We have yet to be told the bore or wall thickness of the bulged barrel gun.
At the time this G grade 16 Parker was made, the Parker recommended load was 7/8oz at 2 1/2 drams. How do you know the shooter did not go to the RST tent 75 yards away and get a box of shells with exactly that load? Why would that not be the most likely scenario?
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