A statement in the Vihtavuori manual caught my eye. It sayed, "The Poisson Effect is usually very small. The forces due to the Magnus Effect are also small when the trajectory is flat. With a big shooting angle, however, it may happen that at the top of the trajectory the Magnus Effect is bigger than the Spin Effect and the bullet will move to the left." Now after reading this it makes me wonder how "big" of a shooting angle does it take to move the bullet left instead of right as I had believed it would in any case?