If Grizzly was referring to Ryan's original speed range post then I believe it is as large as it is because of differences between Ryan's setup and the advertised specs for the IBO speed rating. I think that was a question I had earlier in this thread.
I think Grizzly's train of thought was completely different than yours, Frank. He was suggesting the wide variance could possibly be due to different mods being offered on the Black Ice in referring to the acceptablerange that Diamond publishes for the Black Ice, which is listed as 309 - 317 fps -- irrespective of Ryan's testing.
Again, for those wondering... it's just the acceptable range in which abow will be allowed out the door, while allowing for nuances of mass production. There are no "smooth" and "fast" mods with the Pinnacle cam on the Black Ice.