Some time ago I had a 12-gauge/32 inch VH or VHE, I don't remember which, on the 1-1/2 frame and the barrels had a high pitch vibration I could feel when fired. I normally hold my left hand partially on the barrels ahead of the forend while shooting clays and it was very distinct and initially annoying but I got used to it. The feel varied a bit depending on the load weight/velocity I was shooting. I attributed it to a harmonic. At the same time I had a 32 inch VH 12-gauge on the 2 frame with heavier barrels and it reacted normally when fired with the same variety of loads, no vibration felt when firing either barrel.
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