It is as close to impossible as anything to get the full speed out of a bow. When they test them, just like they said above, it is with a 350 grain arrow at 70 lbs with a 30 inch draw. The bow is shot by a machine, and there are no accessories on the bow. When you start talking about hunting setups, most people shoot a 29 inch draw, which takes atleast 10-15 fps off the top. Then by the time you have added a peep, silencers, loop or nock to the string you have slowed it down even more. I shoot a PSE X-Force, rated at 348 fps. I have a 29 inch draw, shoot a 375 grain arrow, and with the peep and loop on the string (I currently do not have string silencers) I shoot around 320 fps, which is still smoking. The point is, no matter what the bow is rated, you can bank on losing plus or minus 30 fps with your hunting set up.