About 20 years ago I did some flight shooting after we got some very confused readings from a chronograph at a shoot. An 85 pound longbow shooting 7.125 gpp net bop 27", a 64 pound Schulz 8.52 gpp same fletch and length and a 51 pound Schulz shooting 495 grain cedars with the same fletch and length. I shot them repeatedly for length and without fail, the 51 pound bow came in just a little bit behind the 64, while the 85 pound bow with the very low arrow weight had the least cast of all by 15 yards. All bows were drawn as close as possible to the draw and shot at the same angle. One can say that on one hand the numbers don't lie, but on the other hand they do lie. The numbers on the side of the bow, means poundage, it does not always mean cast. When I teach someone how to shoot a longbow, I am impressed with how smooth and in control they are with a bow they can handle with ease, even though without fail, they always want to push for more draw weight. Pulling a heavy bow can be a fine and fun thing, but the fun goes away if the struggle is too much and the accuracy is not there. I did pretty well with the heavy bows, but I wish now that I would have capped it a bit below 70 pounds. On the other hand, shooting my right hand 60 pounder today, I was on, maybe all of those years of shooting over 80 pounds had something to do with that, who knows.