Scope ring height
Hi all I've got a vortex viper 6.5-20x44 that I am looking to mount on my Remington 700 varmint in 223 with the heavy barrel. I have settled on Burris tactical rings but now need to decide on what height. I have been told that the bell on this new scope is 56 mm externally and I know the tube diameter is 30mm so if I divide the tube diameter by two along with the bell diameter, then subtract the tube from the bell(28mm-15mm=13mm)So I need at least 13mm of height from my rings and base combined. The Burris medium rings are supposedly 1/2" or 12.5 mm so I would assume that the bases would be at least 5 mm or so leaving me a ~4.5 mm gap between my scope and the barrel or receiver. Please let me know if I am correct in my thinking or if there is another way to figure this out. Thanks again.
Also if there are any other sets of rings I should look at let me know. And as usual I'd like to keep the scope as low as possible