New Scope - What Ring Height?

B

beeker77

New member
Ordered a SIGHTRON SIII 8-32x56mm 30mm to be installed on a 20 MOA base (adds about 1/2-inch to the scope height). Awaiting delivery.

Best Guess: What height scope rings for this setup? "Normal" (low), medium, high, or extra high.

On the intended rifle, the butt stock cheek rest is adjustable for height.
 
Probably high will work. I have one 56mm bell scope and I do not recall ever using anything taller.

Do some googling of ring makers and they will likely have a chart of suggested ring height.

Make sure you know what diameter tube you have before you order the rings.
 
It depends on what rings you're planning to use. Some brands are different than others. If your base is really that tall, there are a number of medium rings that will fit, and maybe some lows.
 
What rifle? I have a 50mm obj on a Savage Bull Barrel in low rings. . . .Gun, mount, barrel all matter. After that, I just do the math from scope center to action = obj + gap I want -barrel taper change from action top to ~ where the obj bell will be.

so,

B = Base height
R = Ring height (base to bottom of scope tube)
T = Scope tube dia
O = Obj outer diameter (scope mfgr's will give this to you or it is on their site or you measure the actual scope
D = Action top - barrel top (to be reasonably accurate, just lay the gun on a sheet of paper and trace it. Then extend the action line(pretty straight) out over the barrel profile. Using pictures or the actual scope figure out where the bell will be closets to the barrel. Then measure the action line to barrel profile distance.) BTW, I just looked at my gun and guessed and was fine. You will be as good as your guess.
G = Barrel to scope gap MIN

** Convert all units to inches.


Then,
B + R + T/2 = O/2 + G + D or solved for R:

R = O/2 +G + D - B - T/2
**If you did this right, this is your minimum ring height.
 
Well that 20 MOA base may add 1/2" in the rear, but it actually points the scope "more downward" in front, of course - how much is added at the front of the base? If 1/2" is added over normal at the front, then I'd get medium rings for 56mm (maybe even low). If 1/2" at the rear, then probably high or xtra high.
 
You must log in or register to reply here.
Back
Top