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What is my scope calibrated at?

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(@josh3rd)
Pennsylvania
Joined: 7 years ago
Posts: 278
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Now I know that at 100yds the distance between mildots is supposed to be 3.6inches at your scopes calibrated magnification power but say that you don't have a 100yds or even 50 for that matter. How can you find out? I looked at the website for my simmons pro mag but didn't see it. 


   
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AndyH
(@andy-h)
California
Joined: 7 years ago
Posts: 71
 

Wow!  Very simple math, really!  Place a dot (.) in front of yardage and multiply by 3.6

e.g. 25 yards - .25 x 3.6 = .9 between dots


   
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(@garczar)
Oklahoma
Joined: 7 years ago
Posts: 44
 

Kinda confused at just what you're asking here. The distance between mildots is 3.6" @100, 1.8"@50, .9"@25, etc.  Are you asking at what power your mils are correct? That you'd have to contact the maker.


   
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(@garczar)
Oklahoma
Joined: 7 years ago
Posts: 44
 
Posted by: Andy H.

Wow!  Very simple math, really!  Place a dot (.) in front of yardage and multiply by 3.6

e.g. 25 yards - .25 x 3.6 = .9 between dots

There ya go. Great post. We all love simple math. Thanks sir.


   
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(@josh3rd)
Pennsylvania
Joined: 7 years ago
Posts: 278
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Thanks Andy, so I move my magnification until I'm .9 inches @ 25yrds correct?


   
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(@josh3rd)
Pennsylvania
Joined: 7 years ago
Posts: 278
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See that's the issue. I looked on their website and couldn't find anything


   
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(@garczar)
Oklahoma
Joined: 7 years ago
Posts: 44
 
Posted by: josh3rd

See that's the issue. I looked on their website and couldn't find anything

Call em : http://www.simmonsoptics.com/global/contact_us.aspx


   
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Steve_in_NC
(@steve_in_nc)
North Carolina
Dealer
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Posts: 732
 
Posted by: josh3rd

See that's the issue. I looked on their website and couldn't find anything

Why not find out for yourself?   

1. Place a ruler at 13.9 yards = 41ft, 8in = 500 inches from the objective of the scope.

2. Focus the scope on the ruler and align the crosshair with the ruler.

3. Adjust the magnification until 2 mildot intervals span exactly 1 inch.

Then you'll have found the true-mil-dot mag' setting for your particular scope, independent of any dodgy calibration at the factory.


   
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AndyH
(@andy-h)
California
Joined: 7 years ago
Posts: 71
 

Another reasonable way to do it, but......Can't wait for the response to that! 

Of course, performing this at closer distances invites more error at longer ranges.  Not many have to ability to do it precisely, then will complain about their results.  ?


   
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(@josh3rd)
Pennsylvania
Joined: 7 years ago
Posts: 278
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That's good as well. Thank you Steve


   
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(@josh3rd)
Pennsylvania
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Posts: 278
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True that Andy but I got to working with what I got.


   
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(@hector_j_medina_g)
Maryland
Moderator
Joined: 7 years ago
Posts: 1339
 
Posted by: josh3rd

Now I know that at 100yds the distance between mildots is supposed to be 3.6inches at your scopes calibrated magnification power but say that you don't have a 100yds or even 50 for that matter. How can you find out? I looked at the website for my simmons pro mag but didn't see it. 

Josh;

I'm in Poland now, but read this:

https://www.ctcustomairguns.com/hectors-airgun-blog/mil-as-in-milliradian  

I am sure you will see how easy it is to do it.

If you do not have the 27 3/4 yards needed, then use Steve's halfway method. The longer range will give you less error, specially if you take the precaution of measuring from one edge of a division in the construction ruler to the next corresponding edge as described in the Blog entry.

HTH

 

 

 

 

HM


   
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(@scotchmo)
California
Joined: 7 years ago
Posts: 179
 
Posted by: Andy H.

Another reasonable way to do it, but......Can't wait for the response to that! 

Of course, performing this at closer distances invites more error at longer ranges.  Not many have to ability to do it precisely, then will complain about their results.  ?

There is a little variation in apparent spacing of the subtensions as you move the focal plane in the scope. Usually about 5% from closest to farthest. From 13 yards out maybe 2% or 3%. And from 25 yards out, it's fairly consistent.

Also, when taking measurements at closer distances, you'll get more error if you don't measure to the focal plane. So take your distance measurements starting from the reticle focal plane, not from the muzzle. When the ruler/target is at far distances, it does not matter so much.


   
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