Numerous sources give the 83 as in post 25 and also the 91 in post 24. Not clear if the 91 is a converted figure to reflect the range, or which is really right.
I found this from the NRA's records. 122fps = 83.18, but at a distance that is not specified. The distance is the key to whether 83 is fast or not; the picture appears to place this at quite some distance.
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