Jay, I have three 20ga Parkers, two fluid, one damascus, and all are in the low 30's. My thinnest is a light 2 frame Bernard 12 with .028/.030 but I know that was Parker honed once. That's interesting you should say that about 20ga's but the ones I've seen were all in the low 30's, like .031.
I did encounter a gun where the chokes had been opened and were not concentric. The patterns were lousy and were only saved by opening them up further, correctly.
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