the size and weight of your point/broadhead is usually unique to each individual. it will depend on actual weight, draw length, rest, offset, brace height, and bow grip. in other words it is through trial and error. once you get the shaft spine close and insert weight close (which badgerarrow got you close) it is a matter of getting a few points and broadheads and shoot them all. have fun and decide what shoots best for you. that's what makes stick bows fun. and if you end up with a box full of extras welcome to the crowd.