And actually who cares that much. I am sure the deer doesn't even notice the few fps loss or gain here or there.
True, from that perspective it makes little difference. My initial question though was on something that caught my eye. It is not typical to have that large of a range for a speed rating. I just wanted clarification as to whether it was a typo and/or if there was a specific reason for it.
I believe that 310-318 is with nothing but a nock on the string.
...and the hush kit if I am not mistaken.