Re: Shot radius
I just took my Excal and used my daughter as the tree. Assuming you were sitting in a typical portable stand where you cannot get away from the tree, I would be comfortable shooting in about a 220 degree arc with my Excal. My Parker compound would be a bit more with its much narrower limbs.
The diameter of the tree and the size of your platform would alter that estimate of course.
I support all hunters, regardless of weapon or technique!