I have been using the GT 5575XT arrows for a few years and really like them. Last year I mistakenly ordered the expedition shafts and decided to use them. I set them up indetically to my other arrows but when I shoot them the goup isabout 1 1/2" high at 20 yards. I checked the specs and they are supposed to be the same weight, ect but they fly a little different. I don't know why. I tried re-fletching them and even switched out the practice heads but they still group higher. If you don't mix the two you will be OK
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