Started on another one this morning, this time an elb, projected mass for this next one at 130# will be about 27 oz, so anywhere between 26oz and 28 oz should work. bendy handle on the next one, for elbs i use the standard formula but deduct 1% for every 5# over 50#, a 130# bow i would deduct 16% form the projected mass of 32 oz. Seems kinda scary but i will go with it. Steve