Sounds all good Jack. If you're worried about wobbles range on full mag then drop to a lower one for the shot. Stops you trying to defeat wobbles you can't control. Over time as your position gets better and you use less muscle it will reduce. No hard and fast rule about what mag to shoot on, just use what you like. Most scopes however rangefinder better on full mag in most conditions. There's a small bit of science about optical resolution but for the moment i won't complicate matters with that, just get her marked up and enjoy.