Ke actually doesn't tell you much, momentum is more important. A heavier arrow is always going to carry more energy to the target, period.

I have shot both carbon and aluminum and in my opinion aluminum is the better arrow for the money. They are much more consistent for the same or less money. Take a spin tester to a shop and start spinning carbon and aluminum arrows, the difference is pretty scary sometimes, especially with the cheaper carbon arrows.

And carbons do and will bend or wear out over time. I have had more problems with carbon arrows going bad than I have aluminums, and I shoot thin 2213's. I have never ruined an aluminum that would not have also ruined a carbon. And carbon arrows can go bad and you may not even know it until it breaks.

Aluminums are also easier for me to work with. They are pretty easy to fix and change, I'm not keen on having my inserts epoxied into my shaft.

I guess if I was shooting 3-D a lot and wanted a light fast arrow I might opt for a good carbon, but for every other application I think I would go with aluminum, or maybe an ACC.

I actually tend to get better penetration on game with aluminums than I did with carbons.

Paul