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mil-dot/ varible, how close to 10X?

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Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: August/25/2006 at 21:09
ba_50 View Drop Down
Optics Apprentice
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I was wondering how close you would have to be to a 10X setting on a varible considering how critical the dot is when measuring target?
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: August/25/2006 at 22:50
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You have to be right one if you want to use it for measurement.

Thats why I poop canned my brand new 4x16 and bought a 20x SS from these guys


Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: August/26/2006 at 02:20
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Originally posted by ba_50 ba_50 wrote:

I was wondering how close you would have to be to a 10X setting on a varible considering how critical the dot is when measuring target?

 

Is your question

"At what power setting am I able to properly measure something with mil dots and a rear focal plane variable?"

 

If so, that would depend on the scope. If it's a 3-10, it's "probably" at 10x.

One of the virtues of a front or 1st focal plane reticle is that you are able to "mil" something....or someone , at any and every power setting.   

Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: August/26/2006 at 07:25
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From what I have read, 10X is the standard power for using the mil-dot formulas. I'm considering a SS variable ( say 4x-16x or 4-20x) when it comes out. My question is how close to 10 will it have to be to get accurate ranging? Shouldn't they have a 10x detent to get it the same every time?  

Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: August/26/2006 at 08:54
Mike McDonald View Drop Down
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Depends on scope manufactuer.

 On a FFP reticle it doesn't matter.

 On a SFP variable the mfg will tell you.  Leupold uses highest magnification setting, as does Nightforce.

Neither of those is exact unless your particular scope has been sent back to the mfg, collumated, and makred at the exact setting the reticle subtends to 1 milrad.  Problem with second plane reticles is that the power ring might indicate 10x and the actual value would be 9.4 which means you can't range anything accurately enough to shoot it under most conditions, unless the mfg has indicated exactly where the scope has to be set for your particular, individual magnification and reticle.
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: August/27/2006 at 22:22
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Originally posted by ba_50 ba_50 wrote:

From what I have read, 10X is the standard power for using the mil-dot formulas.  

 

Most of the time that's true, but if u want to "mil-range" at the higher powers u can easily do that with even more accuracy than the std. milliradian measurement. Just figure out what the subtension is between dots @ the higher mag. and punch that figure into the equation--

 

tgt. size x range of reticle subtension measurement / subtension / quantity of gap tgt. occupies = range

Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: August/31/2006 at 00:13
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Please expand on and explain further how I can efficiently utilize my mildot retical. I have a 6.6-20X 30 "Lupy".

Thanks

Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: August/31/2006 at 03:08
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Hey Toklat-- welcome. My suggestion is to go to the website that Optics talk has put together for mil-dot users right here-- www.Mil-Dot.com that gives an excellent breakdown on how to use "the system." The pic of the mil-dot on that site is the oblong dot that the USMC developed. Yours is probably the round dot that's similar to the Army's system. There is a difference that's important to note. If u go to the Leupold site, and access the reticle pg. it will give u a breakdown of the mil-dot that they're/you're using (the dot diameter is .2 mil).

 

If u're interested in applying any reticle "tactically" for downrange zeroing, windage and ranging here's another reference souce u may be interested in-- www.ottllc.com/specialtypistols/sp20.pdf

 

Another excellent source of reference for manipulating ballistic/ranging reticles for downrange zeroing only is right here www.burrisoptics.com /Tech. Notes pg.

 

Whether u want to apply the reticle for ranging, windage, downrange zeroing, or moving shots is up to u. There r advantages to every system, and depends mostly on your application of it.

Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: August/31/2006 at 03:30
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Something i just happened to notice about ba_50's posting. If u're reticle ranging on other than the milliradian calibrated magnification (in a second focal plane scope)  the dot diameter will change linearly with the magnification change, but the relative measurement will not. It will always be .20, .22 or .25 of whatever the dot to dot subtension is depending on what mil-dot scope u're using.
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: September/02/2006 at 09:10
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Originally posted by ba_50 ba_50 wrote:

       SS variable ( say 4x-16x or 4-20x) when it comes out.    

 

It's hard to second guess the imaginary scope that doesn't exist.

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