Hi Dan,
Welcome to NAFEX! I am very glad to have you here.
You wrote a great description on using rangle a few years back that really stuck with me. It has helped me out with birds (from falcons to goshawks to redtails and Cooper's hawks) numerous times.
I have used it enough now to know how and when to apply it and appreciate its value.
Perhaps at some point, you will write this out in a post for everyone else.
It is some good stuff...
Best Regards,