It depends on how wide the bow is right now. Binghams poundage chart is based on an 1 1/4" wide limb. I think the 64" R/D would be stable as narrow as 1 1/8". You can loose up to 5 pounds by rounding the edges and I have removed 7 pounds by trapping the limbs. If you sand .010 off back and belly you will drop about 8#, I wouldnt sand off any more than that. Is the bow 64" long groove to groove? Also, I used to have a bow scale that was off by 7#, that one caused me a bunch of problems.