Arthur, I couldn't agree more. It is absolutely true that forcing a person to practice, among lots of other things is impossible. Althoug, why forcing someone to practice is a mystery to me. There is some sort of viceral satisfaction in hurling a projectile at a target, and having the projectile hit the target. It doesn't really matter what the projectile is either. Modern compound bows are a joy to shoot, you being a tradtional archer have known thejoy of no hand shock, super quiet shooting for years. Besides, we owe it to our quarry to practice. They are magnificant, respect worthy, practice worthy animals!

Here is a quote from Dr. Ashby's work (fascinating reading) about momentum and KE and how it applies to arrows with the same KE but different mass.

"Given two arrows of equal momentum, but with one deriving a greater portion of its momentum from mass than the other, the heavier arrow will change velocity (decelerate) at a slower rate as it passes through the tissues. In other words, the heavier arrow will retain a higher percentage of its impact velocity at any given time period during its passage through the animal’s tissues, thus it also retains a higher momentum at any given point during the time required for the arrow to penetrate."