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What Variable to change Wen truing my Weapon at Extended Ranges

 
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  #8  
Old 04-29-2014, 02:38 PM
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Re: What Variable to change Wen truing my Weapon at Extended Ranges

Quote:
Originally Posted by seidersjoden View Post
Another input to be concerned with is the difference between line of bore and line of sight that is, sight height. If your scope base isn't canted this can be measured. If canted, measure then calculate the fudge factor.

Bringing at least these things into alignment will get you where you want to be.


Im curious about this too. For example, I have a 20MOA base, are you saying that I need to measure from the front of the scope for proper scope height or from the middle of the scope. I would think the front but could be wrong.

Joden[/QUOTE]

I measure at the middle of the scope tube as I also have a 20MOA base. Measure the gap between the bolt and bottom of the scope tube. Add this measurement to half the bolt diameter and half of the scope tube diameter and you'll have your sight height.
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  #9  
Old 04-29-2014, 08:04 PM
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Re: What Variable to change Wen truing my Weapon at Extended Ranges

I have done this in every way possible since my first "precision" rifle that I owned 58 yrs ago. I can tell you if you want to simplify the learning curve and save some headache of tuning then the Burris Eliminator is second to none.
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  #10  
Old 04-30-2014, 12:25 AM
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Re: What Variable to change Wen truing my Weapon at Extended Ranges

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Originally Posted by Tumbleweed View Post
Im curious about this too. For example, I have a 20MOA base, are you saying that I need to measure from the front of the scope for proper scope height or from the middle of the scope. I would think the front but could be wrong.

Joden
I measure at the middle of the scope tube as I also have a 20MOA base. Measure the gap between the bolt and bottom of the scope tube. Add this measurement to half the bolt diameter and half of the scope tube diameter and you'll have your sight height.[/QUOTE]

I have to ask, what made you think of doing this, were corrections on a ballistic calculator not correct and you assumed it was an incorrect input of sight height?

Thanks,
Joden
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  #11  
Old 04-30-2014, 12:29 AM
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Re: What Variable to change Wen truing my Weapon at Extended Ranges

Quote:
Originally Posted by idaho elk hunter View Post
I have done this in every way possible since my first "precision" rifle that I owned 58 yrs ago. I can tell you if you want to simplify the learning curve and save some headache of tuning then the Burris Eliminator is second to none.
Using the burris doesn't solve the sight height problem, plus try shooting the burrris out past 1000y with only a 12 power objective lens. Just my thoughts

Joden
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  #12  
Old 04-30-2014, 11:57 AM
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Re: What Variable to change Wen truing my Weapon at Extended Ranges

First off...don't get all hung up on scope height. Assuming a 300 yard zero. If I am off by 1/2 inch...say 2.0 instead of 2.5 inche scope height.....a HUGE error, my impact only changes 1.2 inches at 1000 yards.... 1/10 moa!!

So don't sweat the small stuff.

Now, that being said..I STILL like to know.


So....1/2 diameter of action. That is easy......Take remington 700's and 40XB's...1.35 inch. Divide by 2 = .68. Just measure your action or look it up and divide by two.


PLUS


1/2 scope TUBE diameter say a 30mm tube... 1.18 devided by 2 = .59 inches.


PLUS

Measure the distance from the bottom of the scope base (where the base contacts the top of the action) to the bottom of the scope ring where the bottom of the scope rests in the ring..... lets say for this case is 1 inch.

So.... .68 + .59 + 1.0 = 2.27 inches.

If you have a 20 , 30, or whatever MOA base, and you are truly, truly ANAL......measure BOTH the front and back ring/base height and divide by two and use that number. But really.......come on!!

Simple math.
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  #13  
Old 04-30-2014, 03:00 PM
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Re: What Variable to change Wen truing my Weapon at Extended Ranges

Quote:
Originally Posted by 4xforfun View Post
First off...don't get all hung up on scope height. Assuming a 300 yard zero. If I am off by 1/2 inch...say 2.0 instead of 2.5 inche scope height.....a HUGE error, my impact only changes 1.2 inches at 1000 yards.... 1/10 moa!!

So don't sweat the small stuff.

Now, that being said..I STILL like to know.


So....1/2 diameter of action. That is easy......Take remington 700's and 40XB's...1.35 inch. Divide by 2 = .68. Just measure your action or look it up and divide by two.


PLUS


1/2 scope TUBE diameter say a 30mm tube... 1.18 devided by 2 = .59 inches.


PLUS

Measure the distance from the bottom of the scope base (where the base contacts the top of the action) to the bottom of the scope ring where the bottom of the scope rests in the ring..... lets say for this case is 1 inch.

So.... .68 + .59 + 1.0 = 2.27 inches.

If you have a 20 , 30, or whatever MOA base, and you are truly, truly ANAL......measure BOTH the front and back ring/base height and divide by two and use that number. But really.......come on!!

Simple math.
All great info thanks 4xforfun
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  #14  
Old 04-30-2014, 07:48 PM
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Posts: 134
Re: What Variable to change Wen truing my Weapon at Extended Ranges

Simple math. [/QUOTE]

So 2.27 inches should apply to me because I have a rem 700 action and 30mm tube right?
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