I've found some of these arrows that are long enough from a source and wanted to know which one would be considered a stiffer arrow and how do you tell this. I know one is fatter but thinner and the other smaller around but thicker. It seems like they would come out very close in spine,but I never knew how this was determined. Thanks.
The 2216 (spine =.376") are stiffer than the 2117 (spine = .407") arrows, although they are both the same weight (348 grains at 29 inches). Numbers are from Easton's chart.
Mike
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Check out Arrow chart in How To Section