Silent,
Yes, that is true. It is possible and some people do shoot fixed blades above 280 fps. But, I wouldn't recommend it for the average bowhunter. Once your arrow goes above that it can become unstable and unforgiving. It also depends upon the broadhead. Certain fixed blade broadheads can't fly at those speeds without planing severly. I myself shoot carbons. Simply because that's what works best for me and with my bow. But, my husband loves his heavy alluminum arrows because of the high kinetic energy that it carries. It will blow through an elk like a hot knife through butter! I've seen it's power and am quite impressed that it can be controlled so well with the appropriate setup.