Help calculating magnification using FOV

At the moment I want to achieve accurate magnification of sniper scopes using FOV.

The problem is I’m not completely sure how to go about this to produce accurate magnification similar to their scopes real life counterparts.

Before, I used to subtract the default FOV (70 in my case) by the magnification (4x as I’m using a 4x scope), multiped by 10 (making it 40) to try and get the accurate magnification of a 4x scope. At the moment I’m using 70 FOV (default FOV) divided by the magnification (4x) as I read off a forum along time ago that this was how to get accurate magnification using FOV. Please help if your a gun-nut or know anything about what I’m talking about.

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