Spot on for me. It read 815 and that's what I expected. If its the same chrono we used at Sywell, which I think it was, then it read 814 on that day.
Nice to have a decent chrono. The ones used for the GPs had me anywhere between 740 and 790.
I haven't touched my power setting and use Express's and try to get just over 800 fps with my Combro 4.
EV2 Mk3+Sightron SIII 10-50 x 60 LRIRMOA / Bushnell 8-32
Theoben Rapid 12 FAC
GROWING OLD IS NOT FOR SISSIES