There's an article in Peterson's Bowhunting about this topic. He did the same thing 10 years ago and said it was 260 fps. However, he said with modern equipment and such that 280 fps is the max. However, how well everything is tuned is ultimately the answer. That's surpising about the Muzzy comment. There are plenty of people that have no problems with Muzzy and I'm sure shoot them at 280 fps or faster.