My guess is a gun returned to Parker for choke work would be reamed honed and tested for pattern. Most New Parker’s were ordered with specific pellet count and distance requirements, I would think a gun returned the same.
Most, not all, gunsmith today open to a specified measurement, not testing the gun for pattern or point of impact. If a Parker, its done in a barrel that was bent to regulate not machine made all alike like modern barrels. Not a simple job to set up. A lathe cuts fast takes a lot of time and experience to set up the work. Further from true harder the set up.
Best way to tell how the work will be done is the cost. Low cost means quick machine work with no testing. Pay a lot you should get good work.
William
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