That arrow and point weight combo seems awfully stiff for that poundage and draw length. The chrono might be thrown off due to poor arrowflight coming off the bow.He might want to find a betterspine match and try the chronograph again. The last Martin Mamba Iput through the chrono was45#@28" shooting a 530 arrow at 160 fps for a 5 shot average. My draw lenght is around 28.5".
now im curious about these guys that say they got Curves that shoot 190-195fps...what are they pulling 70LBS with a 500 grain arrow???
Probably less than 9 grains/# with a draw length of 28" plus. Your friend won't see those kind of numbers with a 26" draw and shooting 10.5-11 grains/# in arrow weight.