Originally posted by Danny Rowan: Ok,Go up one spine from draw weight=60#, subtract 5# for non center cut=55#, add 5 for ff string-60#, add 5 for every inch of arrow length above 28"=70#, add 5 for head over 145=75#.So, your 60/65 would be ok if doug fir, 65/70 might be better with the 145 gr head, but for a hardwood and any head over 145gr,I would go 70/75answered your email Jerry.Danny