The Illusion and Grand Illusion have the Helios weight block, but the RG is modified to be more in the med/low range which might make it lope a pinch longer. GI/I is 2.52, Horizon was 2.48. Very slight difference in numbers.
Second Dimension is closer to the RG/Diff numbers if you are trying to get dead on.
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"Why don't you call me sometime.....when you have no class" ~~Rodney Dangerfield to Sally Kellerman, his college professor in Back to School ~~1986
Mike Craig - Storm Products Pro Shop staff -Columbus, OH