ORIGINAL: ArrowMike
If you want 63 lbs just buy a 60 it should top outabout 62, It will also shoot better than a 70 cranked down to 63. That's what i did.
I think this somewhat depends, because I've seen a few bows, including my Reflex that will certainly crank to 73#, but it shoots much nicer about half to 3/4's a turn out. I had to find that out the hard way, couldn't get things to tune as well as I wanted, lots of inconsistency, backed the limb out, 1/2 and 3/4's turns, an voila, RH's in a couple of tuning sessions. Did the same thing on another bow trying to see if that would help it any, and the same result, RH's with two differet bows on consecutive days.