Equipment & Gear > Guns and Ammo
Ask RBros Thread
Bob33:
Thanks!
Branden:
What do you think of Trigger Tech riggers?
Regards, Branden
Bushcraft:
--- Quote from: rbros on August 23, 2016, 05:30:30 AM ---
--- Quote from: Bushcraft on August 22, 2016, 06:58:08 PM ---Great idea for a thread!
Where is the best/correct place to measure sight height (center bore to center scope) when using a base with 20 MOA built into the base? And, how much does it really matter?
--- End quote ---
Here is an easy way to do it. Lets use the following scenario:
You barrel shank is 1.25" diameter, so half that is: .625"
Your scope is a 30mm tube or 1.181", so half that is: .5905"
The distance from the top of your barrel at the recoil lug area to the bottom of the 30mm tube section is: .729"
Add those all together and you come up with 1.9445", round that to 1.95" and put that into you ballistic app. A slight difference in height won't make that much difference, but if you leave it at the default number of 1.5" of most apps, you would be a bit off at distance using this example.
--- End quote ---
Hmmm...the how-to wasn't the question. Got that.
How much, if any difference does it make when/where measuring the sight height when using a 20 or 40 MOA base? For the sake of taking it to the extreme to see if there is a gnat's ass worth of difference, for example let's use a 200 MOA base and a long NF 5-25 NF-type scope. Is the correct place to measure at the eyepiece, turrets that house the reticle or the objective. Each will represent a significantly different measurement. So, where is the best place to measure and what, if any, real world difference does it make?
rbros:
Midlength of the scope would give you an average. On a long action 30 MOA rail your talking about .042" of slope roughly in the length of the rail. Using the mid point of the scope would get you and average, but like I said, its not a huge bearing on impact whether you measure at the lug area or the eyepiece.
Bushcraft:
Thank you.
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