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# center of scope to bore exbal question

#1
04-29-2010, 12:07 PM
 Silver Member Join Date: Mar 2008 Posts: 483
center of scope to bore exbal question

What i am doing now seems to work, but a friend and I are doing this a little different so i wanted to hear how you all are doing this. do you measure the distance from center of bore to center of scope to input into exbal from:

1) near the bolt, or

2) at the front of the scope

with a slanted base the two measurements would be slightly different ( i am thinking) but please correct if wrong.

thanks alot guys.
#2
04-29-2010, 03:13 PM
 Platinum Member Join Date: Nov 2006 Location: Dayton, Nevada Posts: 1,775
Re: center of scope to bore exbal question

I measure the distance between the bottom of the scope and the top of the bolt. Then I add half the diameter of the scope tube and half the diameter of the bolt.
#3
04-29-2010, 03:42 PM
 Silver Member Join Date: May 2007 Posts: 252
Re: center of scope to bore exbal question

What I was always told, and what I do is use the middle of the bolt. I measure just in front or behind the turrets, which ever is closest.

Works for me.

Southpaw
#4
05-01-2010, 09:19 PM
 Junior Member Join Date: Dec 2006 Posts: 11
Re: center of scope to bore exbal question

I take a slightly different approach when looking at the height of the scope above the barrel.

From the objective end, I measure the scope complete. I then measure the gap between the bottom of the scope and the top of the barrel. I thing measure the barrel just below the objective end. Add all three and divide by two. It works well for me and is vary accurate as I can use my calipers to measure each. I would suggest this method takes out some of the guessing on the centre.
#5
05-01-2010, 09:37 PM
 Gold Member Join Date: Feb 2008 Location: Sonoma County, CA Posts: 822
Re: center of scope to bore exbal question

Quote:
 Originally Posted by morpheus32 I take a slightly different approach when looking at the height of the scope above the barrel. From the objective end, I measure the scope complete. I then measure the gap between the bottom of the scope and the top of the barrel. I thing measure the barrel just below the objective end. Add all three and divide by two. It works well for me and is vary accurate as I can use my calipers to measure each. I would suggest this method takes out some of the guessing on the centre.
I can see dividing the objective diameter and the barrel by two, but why don't you leave the distance between barrel and scope whole?
#6
05-01-2010, 10:33 PM
 Gold Member Join Date: Jan 2008 Location: West Central Idaho Posts: 943
Re: center of scope to bore exbal question

For a bolt rifle…….flash hole in the receiver to center scope tube. Use a caliper. Simple to do.
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#7
05-02-2010, 10:49 AM
 Junior Member Join Date: Dec 2006 Posts: 11
Re: center of scope to bore exbal question

Quote:
 Originally Posted by Moman I can see dividing the objective diameter and the barrel by two, but why don't you leave the distance between barrel and scope whole?

My bad...that is what I meant....

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