Re: ring height question?
I gave you enough information to ask the right questions, without having the parts in hand.
If you were to figure out the right questions to ask, there are many here that have that scope and a set of calipers that could get you the measurements you need to know exactly how high of a base you would need with how high of rings to have your objective as low as possible off your barrel, and your erector housing as low as possible to your base.
You have the rifle, the info is here for the asking. If I had that model NF I could have measured my objective and furnished you with that, but I don't.
Did you want folks here to go to Farrell's site, get the measurements for their rings, do the math on how high your centerline would be, then how high of a base you would need to clear how much lower your barrel is from the top of your receiver at the distance out you'd expect the objective to be, and then spoon feed that to you?
I have a 58mm objective mounted in VTac 35mm lows and the objective is about .010" off my barrel with a M24/MTU contour tube-does that help you (of course not!).
Good luck with your mounting, and keep in mind that you asked the question. Your second post is correct, and if anyone with the same barrel contour and that scope shares what rings they use be sure to ask what base as well, then consider BadBot's point.
You may be right, me having a high post count may mean that I don't get out and shoot, and that I am just parroting shit I read online and have no practical experience with a precision rifle and putting them together.
Then again, you may be wrong.......
I hope train's are easier to work on than rifles......