I've found that their chart is pretty much right on the money for ANY "high-performance" recurve with a FF-type string. I've shot bows a lot faster than Widows, and some a lot slower.

Remember, your release will have a lot to do with what spine arrow you will need. No two archers are alike, so there are no "hard & fast" rules. What I recomend is to start out with the "average" recomended shaft & leave it long. You can then fine tune by using different weight tips and slowly shortening as needed.

JRW