We took the factory string off a Mach X and put a after market string on and last 10-12 fps.. Everything is in spec. and it shoots and feels as good or better then before, but why the speed loss? We went from 277-278 down to 266-267 at 71 lbs., 405 grain arrow at 28 3/4" draw.
He ordered the string from Vapor Trail so its their blend, I know the factory PSE string for that year is 8125. They did serve the idler also, that and the string material is probably the cause.
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