Parker barrels are very consistent from the measurements I have taken on my 13 Damascus guns from 10ga to O frame 20ga. All 13 guns are .040 or more at 9 inches and all are .030 plus min. wall except one 12ga #3 frame that was returned to PB with the request "take dent out of barrel". That barrel is has a spot that measures .026. My 6 frame 10ga has a min. wall of .080 in both tubes.
I did purchase a Parker 16 ga that had been honed and had barrels with a min. of .019 and .035 at 9 inches. The .019 was to close to where I hold my left hand for comfort so I sold the gun.
My Fox guns are similar but tend to be very close to .040 at 9" and one tube measures .036 at 9" the gun is very high condition but the bores are .733. Many Fox small bores I have measured and/or owned have min. walls of .025.
I don't feel a need to have them proof tested, but go with the practice shoot shells for which the gun was designed.
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