On older skeet guns it was common to have the right barrel choked more than the left, because targets were shot from the low gun position, and the outgoing target would be further away than is normal today. I once owned an IJ Skeeter in .410 that was so choked. My preference in a .410 double for quail hunting would be 0.007" constriction in the right barrel, and 0.011" or 0.012" in the left. Also I would restrict my shots to 30 yards or so.