Sorry Paul and I apologize to Arthur for naming the wrong person.

I've read more of Ashby's report and found it interesting reading.According to him the lighter and faster arrow generates more friction and therefore should stop faster in a target made to use friction. However, if the lighter arrow has a smaller diameter then this negates the additional friction from the faster arrow. With my set-up the taget moves just as much and is just as loud when it strikes.

The lighter arrow actual has moreKE than the heavier one. You can use a chrono to get your velocity and you know the weight of the arrow. Therefore, you can calculate the force.

I definitely agree with you that I know what works for me and really do not need somone else telling me that it's not good enough.