One thing I' ve noticed with the dual cams is as the arrow gets lighter, they really start to pick up speed. But I think the efficiency of the different cams has some bearing on this as well. My Pat Dually at 55# shoots a 368 gr arrow 288. My P38 DC at 55# shoots the same arrow 278. They both do 301 with a 301 gr arrow. I don' t have a lighter arrow, so I don' t know if the P38 would be faster than the Pat with say a 275 gr arrow.