BowTech uses electronic digital scales that measures to the tenth of a pound.

I really can't believe that the bow would have shipped at 66 lbs. since the bow probably wouldn't have shot it's advertised speed 4 lbs. under peak. I would tend to think maybe both scales were calibrated wrong? I use a 25 lb. weight to set mine.

If it's a problem, get with your dealer so he can get it taken care of ASAP.