# Measuring the scope hight

Discussion in 'Long Range Scopes and Other Optics' started by JAWZ, Jan 5, 2009.

1. ### JAWZWell-Known Member

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Can somone please explain where it is measured from and how to.

Thankyou

Andrew

2. ### candersonWell-Known Member

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Andrew,

This is my interpretation. I would take the objective end of the scope and measure with a caliper. Take that number and divide by two. This will yield a number from the center line of the scope to the bottom of the objective. The next step gets a little more complicated. I believe if you are using picatinny type base, ring height is measure from the top of the picatinny base to the center line of the ring (Seekins precision has a good diagram). As far as getting a height of the picatinny rail, I believe you would probably have to contact the manufacturer or install it on the gun and measure. Barrel contour/taper will probably play a huge factor is mount selection. You should be able to do some math and determine which ring height will work for your application. As for standard type ring/base combination (ie Leupold) I believe that the ring height is measured the same way, but I do not know about the base height. Anyway, just my take on the matter, I may be dead wrong. Hope this helps. Just a personal note, on most of the leupold dual dovetail mounts, I have been able to use one size shorter ring than is recommended on the leupold website.

Chris

3. ### AJ PeacockWell-Known Member

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Canderson has it right.

A quick way, that is nearly as accurate is to slide the bolt back until it is directly under the scope bell. Measure from the bottom of the bolt to the top of the scope bell (be careful of any slop you have in the bolt). Then subtract half the bolt diameter and half the scope objective diameter. Or just eyeball from the center of each with your calipers.

It sounds a little 'shade tree', but it is easy and gives nearly identical measurements to other methods.

AJ

4. ### candersonWell-Known Member

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Thanks AJ

Could a person also insert a rod guide into the action and measure from the top of the rod guide to the bottom of the scope? Then add half the diameter of the rod guide and half the diameter of the scope tube. I believe theoretically this would work, May depend on the fit of the rod guide. My sinclair for my weatherby fit the action pretty tight. Thanks for any input.

Chris

5. ### AJ PeacockWell-Known Member

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That would work just as well. Measure it several different ways and you will find they are all very close.

AJ

6. ### JAWZWell-Known Member

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Thanks for all the help guys much appreciated

ANDREW