Rifle Scopes question on angle degree indicator with level!

[whitenup11]

Im looking into adding this to my scope. there is one the comes with a level and ADI mount. Any thoughts on these things? Is the level really necessary? I can see where the ADI can come in real handy i certain situation, but I feel the level something NF can sell for more money. thoughts???

 

[djskit]

A level is an essential piece of gear out past 600. The scope and the bore need to be plumb or your adjustments in elevation will be skewed off to what ever direction the rifle is canted. Makes accurate wind adjustment very problematic.