Thanks for posting those wonderful photos. I am amazed that the shot string can be seen in some of them. Just imagine how one's shooting would improve if that kind of feedback was available in real time! Maybe some day...
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I realize that ethics are subjective, so without characterizing/disparaging anyone else's, I got nothing out of the one tower shoot I was on and I see little difference between a tower shoot and shooting at driven birds, both of which seem to be all about the shot.
To me, it's about the pursuit of game; the shot is just a small (but important) part of the hunt.