RE: Fastest bow
315- 320 is about the average limit these days. It's not surprising to at least one bow in a line up with at least that for an IBO speed. My mighty might is rated at 322 at the high end as well.
Bowtech is probably one of the few companies that will actually produce what they though. Some others will as well. Darton will usually hit the speeds the rate thier bows at, as well as parker from what I understand. And from what I understand mathews is getting better in that regard. They have always made great bows, but the speeds tended to be a bit over inflated. Nothing drastic however, they are usually in the ballpark.
It's not hard at all to find bows with a 300 fps speed rating now, most of them are at least that. Doesn't mean however those are the actual speeds you will see from them.
Paul