Perhaps an email or a call to your bows manufacturer would answer your question.

It should also be noted that some of the different bow companies fudge a little on the speed ratings. Most of them do not put a peep sight, a nock, or string silencers on their test bows as these items will also slow down your arrow speed.

I couldn't tell you what my particular bows IBO or AMO rating is, but I can tell you that at a 30.5" draw, set at 65#'s, shooting a 403 grain arrow, it is moving at a very quiet 271 feet per second.