Not sure what you mean by "performance difference" but at 25 yards out of my "Wad Gun" both 200 and 185 swc's cut a ragged hole at 25 yds for a group. At 50 yds they will both stay well inside the 10 ring on a standard 50 yd bullseye target, I wish I could do as well! The only difference for me is slightly less recoil with the 185 when loaded to the same velocity as the 200.
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