Okay Buddy, you're partly right! True draw length is measured just as you say, from the bottom of the arrow nock to the center of the arrow rest bolt, or the low spot in the handle of a recurve bow riser. But what about the straight handle longbow? Think about it? If you draw and anchor at the same point with that longbow as you do a recurve and you mark the arrow in measuring to the front side of the bow-the side away from you- the measurement will show about an inch shorter?...But, if you measured your draw length to the back side of that longbow-the side toward you- your draw length measurement would be just about the same. So instead of the 28" draw length you always thought you were doing, your draw length is actually 25.5" as measured on a 2.5"wide recurve bow riser!
Now according to that, unless the AMO standard draw length measurement is used to determine your bows 50# @ 28", you are really drawing about 44#
But do not get discouraged, because about 92% of the bows made today are measured out by the AMO standard
Thank You! And have a good evening! scout4<><