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Need some help understanding Sightron reticles

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Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: January/28/2011 at 09:11
1972 View Drop Down
Optics GrassHopper
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I want to purchase a Sightron scope for use on a 6mmBR Norma I recently acquired.  I intend to use the rifle primarily for shooting at distances between 600 and 1000 yards.  Obviously, mostly target shooting.

 

I used to do a lot of shooting but have been out of the sport for a number of years (more than I care to count), so a lot of the equipment available today is new to me. Scopes, especially, have made some significant advances in technology.

 

I’m thinking in terms of the Sightron SIII SS 10-50x60 but there are a few options in reticles I’m not sure about.  I was hoping to get some enlightenment and advice.

 

The SIII SS 10-5-x60 LR FCH I understand.  Long Range Fine Cross Hairs.  That’s straight forward enough.

 

The SIII SS 10-5-x60 LR MD I partially understand.  The LR MD obviously stands for Long Range Mil Dot and the manufacturer says this reticle type is “indexed at 24X  .  I’m just not sure I fully understand the difference between this scope and the LR MD/CM.

 

The SIII SS 10-5-x60 LR MD/CM.  I’m ashamed to say I don’t know what the MD/CM stands for.  The MD is clearly Mil Dot, but I don’t know what the CM added to it means.  And I am not sure of the difference between this reticle and the LR MD.  Presumably it’s going to have something to do with the spacing or size of the Mil Dots and/or the difference in windage or elevation they represent at some given distance.  I just don’t know for sure what.

 

The SIII SS 10-5-x60 LR IR MOA.  Long Range I understand.  Minute Of Angle I understand.  I don’t know what the IR stands for.  I assume this “scaled” reticle provides the ability to judge/allow windage or elevation adjustment as the Mil Dots do, but this one calibrates in Minutes Of Angle instead of inches?  Something like that?

 

Sorry to be so dense but I’m trying to get a good handle on what each of these reticles offer before I make my choice.

 

Would one of you gentlemen care to jump in and shed a bit of light on this for me?

 

Thanks in advance for the help and advice.

Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: January/28/2011 at 09:19
SVT_Tactical View Drop Down
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Chief Sackscratch

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 1/8th target dot LRTD
 Fine Crosshair   LRFC
  Mil-Dot LRMD w1/8MOA turrets
 
 Mil-Dot   LRMDCM w .05ml turrets
 
  Modified MOA w/ illumination LRIRMOA 1/8MOA turrets
 
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: January/28/2011 at 10:07
1972 View Drop Down
Optics GrassHopper
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Thanks SVT_Tactical.  It’s getting clearer, but I’m still a bit confused.  Sorry.  Perhaps I don’t understand MOA as well as I thought I did.

 

If I’m interpreting the manufacturer’s technical information correctly the “sight picture” presented by the reticle in the LRMD is exactly the same as the sight picture presented by the LRMD/CM.  The mil dots are apparently exactly the same size and have exactly the same spacing between them both vertically and horizontally.

 

That being the case, if (for example) you used the second mil dot to the right in either reticle/scope, your point of impact is going to be shifted exactly the same distance at the same range.

 

So the difference between the two scopes has nothing to do with the reticle.  It’s the amount of adjustment one click of the turret represents?  Is that right?

 

So the LRMD w 1/8MOA turrets is going to move your point of impact 1/8 of an inch at 100 yards for every click of the turret.  Right?

 

And the LRMD/CM with .05ml turrets is going to move your point of impact by a different scale for every click of the turret.  What does .05ml represent at 100 yards?

 

I don’t think I’ll go near the LRIRMOA.  The illuminated thing is just something else that can go wrong and cause grief.

 

I’m leaning towards the LRMD.  At least I understand it.  At least I think I do.

Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: January/28/2011 at 10:12
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Chief Sackscratch

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Originally posted by 1972 1972 wrote:

 So the difference between the two scopes has nothing to do with the reticle.  It’s the amount of adjustment one click of the turret represents?  Is that right?

   Correct 
 
 
Originally posted by 1972 1972 wrote:

So the LRMD w 1/8MOA turrets is going to move your point of impact 1/8 of an inch at 100 yards for every click of the turret.  Right?

 correct for all intensive purposes

 
Originally posted by 1972 1972 wrote:

And the LRMD/CM with .05ml turrets is going to move your point of impact by a different scale for every click of the turret.  What does .05ml represent at 100 yards? 
  I am gonna leave this to someone with more knowledge as far as converting it into inches or what not.  Just know that having a mil based reticle with mil based turrets make correcting for misses a heck of a lot easier than haveing a mil based reticle and a MOA based turret
 
Originally posted by 1972 1972 wrote:

I don’t think I’ll go near the LRIRMOA.  The illuminated thing is just something else that can go wrong and cause grief. 
 
 
  unless you need it there is not reason to get it if it will only be a novelty
 
 


Edited by SVT_Tactical - January/28/2011 at 11:44
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: January/28/2011 at 19:29
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Optics Master Extraordinaire
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.05mil is about .18"
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: January/28/2011 at 19:41
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Dark Lord of Optics

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In Sightron terminology, LR is long range and that is simply the name of the model line: S3 Long Range.

MD means Mil-Dot, as you correctly deduced.

CM refers to the knobs, not reticles.  It means that that the knobs have clicks in centimeters at 100 meters, i.e. these are metric knobs.  0.1mil is 1cm at 100m, while 0.05mil is 0.5cm at 100m.

ILya
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