Eeeeewwww. Not a comparison chart.

The bow/arrow wgt combinations are a joke, and the xbow is hardly representative of a modern day stringgun. If you want to get into the details of the physics, I'm your huckleberry (as they say).

But, first look at your 2005 Cabela's catalog. The average fps for xbows is 320 fps with a 420 gr bolt ("arrow") while the average of the IBO speeds for the bows is 295 fps with a 350 gr arrow. The 420 gr bolt is typical for a hunting crossbow setup, the IBO setup on a bow is not.... typical hunting arrows would be a fair bit heavier, dropping the initial launch velocity by a lot.

Typical hunting crossbows have an intial KE of ~100 ft-lb, far higher than the typical hunting compound setup.

I respect the organization for trying to help disabled hunters - I try to do that too. But let's call a spade a spade.