Since no one else will bite... My 16 gauge pheasant load uses nickel plated shot with the very short SG16 wad. I definitely notice more leading in the bores after shooting this load in my FAIR over/under with chrome lined bores. I do not notice as much leading with the Fiocchi Golden Pheasant shells with a slightly longer wad and nickel plated shot, even though the shot cup does not extend to the top of the shot column. I hope this helps.