Long Range Hunting Online Magazine


Go Back   Long Range Hunting Online Magazine > Rifles, Reloading, Optics, Equipment > Long Range Scopes and Other Optics

Long Range Scopes and Other Optics Nightforce Optics


Reply

Sight height?

 
LinkBack Thread Tools Display Modes
  #1  
Old 03-13-2011, 08:14 PM
Junior Member
 
Join Date: Mar 2011
Posts: 25
Sight height?

How do you figure out what the sight height is of your scope to the center of the bore is? Is there a specific way to measure this without knowing the height of the rings?
Reply With Quote
  #2  
Old 03-14-2011, 12:49 AM
Bronze Member
 
Join Date: Dec 2010
Posts: 48
Re: Sight height?

1) Remove the stock.
2) Use a set of callipers to measure theoutside diamiter of scope tube.
3) Divide that by 2.
4) measure the diamiter of the barrel at a point under the scope tube.
5) devide by 2. Add that answer to the first one and set aside.
6) measure from the top of the scope to the bottom of barrel at the point you checked the barrel.
7) subtract the first number from the second. ta da.
Reply With Quote
  #3  
Old 03-14-2011, 08:18 PM
Gold Member
 
Join Date: Jan 2005
Location: Searcy, Arkansas
Posts: 700
Re: Sight height?

The process from nwolf is the best and most accurate way to measure sight height. you can also use a set of calipers or sometimes I will use a 6" steel scale and "eyeball" the center of scope tube to the center of the barrel. I can usually get to within 0.1" or less that way, and I don't have to remove the stock. However, the method from nwolf is the most accurate.

Also, as I assume you know since you asked the question, it is very important to get this right if you are using a ballistic program. If you are off a couple of "tenths" or so it will have quite an effect on the ability of your program to give you accurate down range dial up info.
Reply With Quote
  #4  
Old 03-14-2011, 09:09 PM
Platinum Member
 
Join Date: Jan 2008
Location: West Central Idaho
Posts: 1,034
Re: Sight height?

Another way is to just slide your bolt back until it's even with the rear of the scope and measure center to center. This only works it the bolt fits snuggly in the receiver. If the scope is set way back or the bolt is sloppy this won't work. To do this on my rifle the bolt only has to move rearward two inches.

It will get you close enough but if you need more accuracy remove the stock and use calipers as nwolf noted.
__________________
Jim



There is something about the outside of a horse that is good for the inside of a man. Sir Winston Churchill.

Everything that is really great and inspiring is created by the individual who can labor in freedom. Einstein
Reply With Quote
  #5  
Old 03-14-2011, 11:29 PM
KRP KRP is offline
Gold Member
 
Join Date: Dec 2007
Location: Kuna, ID
Posts: 594
Re: Sight height?

You don't need this measurement accurate to four decimal places...or three...or two...which is good because you probably can't do that. .1" difference in sight height will cause an error much less than most people are capable of shooting. Pull the bolt back, measure firing pin to scope tube then add half the diameter of the tube. Or pull the bolt back and eyeball to the center of tube/rings.
Reply With Quote
  #6  
Old 03-15-2011, 10:15 PM
Gold Member
 
Join Date: Jan 2005
Location: Searcy, Arkansas
Posts: 700
Re: Sight height?

Quote:
Originally Posted by KRP View Post
You don't need this measurement accurate to four decimal places...or three...or two...which is good because you probably can't do that. .1" difference in sight height will cause an error much less than most people are capable of shooting. Pull the bolt back, measure firing pin to scope tube then add half the diameter of the tube. Or pull the bolt back and eyeball to the center of tube/rings.
I agree with KRP that .1 is "good enough" for this measurement, but also advise to not be sloppy about it. At closer ranges errors in this measurement can have a pretty minimal effect. However, as you reach on out there to 1000 yards or so the error can become enough to really matter. After all, with long range shooting it often comes down to a combination of small errors that add up to enough to cause a miss rather than 1 big thing.

Input all your data into a ballistic program, set it for 1000 yards then vary your sight height in increments of .1 and you will see the difference it will make. It may only be 1/2 moa at 1000, but that is 5".
Reply With Quote
  #7  
Old 03-15-2011, 11:02 PM
Platinum Member
 
Join Date: May 2008
Location: South of Canada and North of Wyoming
Posts: 5,954
Re: Sight height?

The way I do it without taking the stock off is to...

- measure the OD of the barrel just under the front end of the scope

- measure the OD of the front end of the scope

- add the two measurements and divide by 2

- measure the distance from the bottom of the scope to the top of the barrel and add to the the previous figure. That's your scope height.

If your measurement is accurate to the closest .1", you're GTG.

-Mark
Reply With Quote
Reply

Bookmarks

Thread Tools
Display Modes


Similar Threads for: Sight height?
Thread Thread Starter Forum Replies Last Post
sight height Tikkamike Long Range Scopes and Other Optics 2 04-29-2011 07:25 AM
SIght Height jkward Long Range Hunting & Shooting 1 04-17-2010 10:06 AM
What defines 'Sight Height'? sdowney Long Range Scopes and Other Optics 13 08-18-2009 09:52 PM
Sight height measurement britz Long Range Scopes and Other Optics 3 08-25-2007 08:16 PM
sight height measurement peppy1hunting Rifles, Bullets, Barrels and Ballistics 4 03-10-2007 06:49 AM

Current Poll
Do you wear hearing protection while hunting?

All times are GMT -5. The time now is 04:55 AM.


Powered by vBulletin ©2000 - 2014, Jelsoft Enterprises Ltd.
Content Management Powered by vBadvanced CMPS
All content ©2010-2014 Long Range Hunting, LLC