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New to MIL-Dot | Zero?

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Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: September/21/2018 at 12:19
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Optics GrassHopper
Optics GrassHopper


Joined: September/21/2018
Location: MN
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Morning,
New to the forum! Thanks for having me.  Sorry for the length.  I am still learning.

I just bought a Burris mtac 6.5 x 20-50 mounted on a WIN 70 270.  It has been bore sighted.

I am taking it up to the farm to zero in for the upcoming deer season.  

This is my first MIL-Dot reticle (scope), 1 click = .1 mRAD


Questions;
What magnification should I start with to zero at 100 yds?

What magnification setting approximately does one mil equal one mil?

I understand this post;
http://www.opticstalk.com/sighting-in-a-mil-mil-scope_topic32905.html

However, the OP doesnt mention any click adjustments.

Don't I want to do that when zeroing in?

-----
If you have time;

I understand how to calculate the distance; once zeroed in, how do I calculate how much to raise or lower per Mil-Dot?


Any other useful information is gladly accepted.

Thanks!
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: September/21/2018 at 12:32
cbm View Drop Down
Optics Journeyman
Optics Journeyman


Joined: January/11/2008
Location: SC
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 I can't help you a whole lot, as I am new to mil-dots myself. I have had one that I didn't use the mil dot function(I just hunted with it like a plex) and I just got another Schmidt and Bender that is a mil-dot, so I am in the process of learning as well.

BTW, nice scope. Your's is a second focal plane reticle and my S&B is a first focal plane. So your mil dots spacing will change with increased/decreased power settings where mine should not(if I understand it correctly). I previously had a Bushnell 6500 2.5-16x42 and it was marked as the correct mils at 10x. Yours may be marked or you may have it listed in your manual. I think there are models that are correct at the max setting. I think you just have to figure out what power it is on your particular scope, but I may be wrong.

 

As far as I know, the power to zero at 100 yrds wouldn't matter.

Personally, I have been playing with online ballistic calculators to figure out my holdovers. There are a bunch of free one's online.

I'm not sure if that really helps but I am sure someone way more knowledgable than me will chime in.

 

 



Edited by cbm - September/21/2018 at 12:37
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: September/21/2018 at 12:49
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Optics GrassHopper
Optics GrassHopper


Joined: September/21/2018
Location: MN
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Thanks CBM. 

Yeah I am super green.  I am grasping most of the math (actually I only understand the distance equation so far).  But if I am zeroed at 100yds and I change my power setting how does that change my reading of mil-dot?

Still trying to figure out zeroing I guess too, I plan on resetting once I get it dialed in.

From manual:
G2B Mil Dot Reticle *Subtensionsshown for High Power Magnification. The G2B Mil-Dot Reticle is a mil-based reticle with hash marks in between the mil dots for more precise aiming, distance measurement, holdover and hold-off for wind. It is a versatile reticle that is ideal for mid-to long-range shooting.

Also:
Once you have successfully zeroed your scope, you can reset the zero on your dials with these simple steps: 1.With turret capsremoved,use the supplied hex wrench to loosen the setscrewslocated at the top of the knob on the elevation and windage adjustment dials. 2. The dial should spin freely. Rotate the dial back to“0”.Do not lift up or remove the dial. 3. Retighten the set screws once the dial is rest. NOTE:You do not have to reset the zero on your dials for your scope to function properly.Doing so can give you peace of mind that your zero is set,plus you can easily confirm if it has moved at any time,but this step is optional.
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: September/25/2018 at 15:22
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Optics GrassHopper
Optics GrassHopper


Joined: September/21/2018
Location: MN
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Alright here is an update;

Sighted in at 100 yds on highest magnification.  Hit inner circle consistently.  Ended up doing 16 clicks up and 10 right.

Last question;
If I change my magnification on my Burris since it is a second (rear) focal plane how do I calculate shots?

Burris mtac 6.5 x 20-50


Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: September/25/2018 at 15:50
supertool73 View Drop Down
Optics God
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Are you wanting to use your reticle to range targets?  Or you are wanting to use it for holdover?

Is the highest mag where the mildots are true?

Its just a formula, but the really complicated part is you don't know for sure if you turn your scope to 10x if its actually 10x, etc. It might be 11X or 9X. 

Other option is to just shoot it at the range on different mags and figure out where they hit.  Ultimately you want to do that anyway.   
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: September/27/2018 at 10:50
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Optics GrassHopper
Optics GrassHopper


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I understand the formula.  It would be for holdovers.  

Highest is where it is zero'ed and true.

When dialing down; is a mil dot a mil dot?
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: September/27/2018 at 11:18
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It will be almost worthless to try and use it for holdovers other than the magnification where the mildots are accurate.  If you choose to do that, you will have to get data at the range for every mag that you will want to use for hold overs as it will be different at every magnification. 

I would suggest since your scope has target type turrets that you dial in your elevation changes.

"when dialing down; is a mil dot a mildot".  The answer with your scope no.  SFP scopes the reticle size when you change magnification does not stay the same size in regards to the object you are aiming at.  Meaning the object grows, but your reticle does not. 

With an FFP scope the reticle size actually stays the same in regards to the object you are aiming at.  So it appears to grow when going up, but it grows the same relation to the object.  So a mil stays a mil no matter what magnification you are on. 

I hope my wording makes sense.

here are a couple pics that should help






Edited by supertool73 - September/27/2018 at 11:24
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: September/27/2018 at 23:05
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Burris MTAC Rifle Scope 30mm Tube 6.5-20x 50mm 1/10 Mil Adjustments Adjustable Objective G2B Mil-Dot Reticle Matte

Finish Matte Black
Waterproof Yes
Weight 18.2 Ounce
Tube Diameter 30mm
Power Variability Variable
Minimum Power 6.5
Maximum Power 20
Adjustment Click Value 1/10 MIL
Adjustment Type Click
Exposed Turrets No
Finger Adjustable Turrets Yes
Turrets Resettable to Zero Yes
Zero Stop No
Turret Height High
Fast Focus Eye Piece Yes
Lens Coating Fully Multi-Coated
Warranty Limited Lifetime Factory Warranty
Rings Included No
Sun Shade Included No
Lens Covers Included No
Reticle G2B Mil Dot
Reticle Construction Glass Etched
Illuminated Reticle No
Reticle Focal Plane Location 2nd
Parallax Adjustment Adjustable Objective
Fog Proof Yes
Shock Proof Yes
Overall Length (A) 14.5 Inches
Eyepiece Bell to Objective Bell Length (B) 5.5 Inches
Objective Bell to Turret Length (C) 1.8 Inches
Eyepiece Bell to Turret Length (D) 2.5 Inches
Eyepiece Length (E) 3.2 Inches
Objective Bell Length (F) 5.8 Inches
Objective Diameter (G) 2.39 Inches
Eyepiece Diameter (H) 1.53 Inches
Objective Lens Diameter 50 Millimeter
Eye Relief 3.1-3.6 Inches
Exit Pupil Diameter 7.6-2.5 Millimeter
Field of View @ 100 Yards Minimum Power 18 Feet
Field of View @ 100 Yards Maximum Power 6 Feet
Maximum Windage Adjustment 50 MOA
Maximum Elevation Adjustment 50 MOA
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: September/27/2018 at 23:20
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 http://www.opticstalk.com/uploads/1566/mil_table_inches.gif

Run a balistic chart for your ammo of choice

You can use the mil dots for hold over marks or you can dial in correction.

You can use the mil dots to determine range to target of a known size target like an 18 inch back to chest deer or a 24 in back to chest elk

Because your scope is 2nd focal plane it is set up to use the mil dots at the maximum power of the scope. 
I would keep in mind that in low light you will want to dial down to brighten up the image so I would practice with it some at 6.5x using the mil dots for hold over points at 200, 300, 400, etc to see how your load corresponds to those distances. You can always dial in correction but it would still be nice to be able to use the mildots for hold over. It will take some time on the range so make notes on what those dots hold over value in distance is at 6.5x so you can make quick shots in low light.

What I would do is take a large piece of paper sight in at 100 or 200 then drop back to 300 shoot 3 drop back to 400 shoot three drop back to 500 shoot 3  etc then go take a can of spray paint mark where the bullets impacted on the paper and return to those distances look through the scope to see what dot corresponds to your spray paint point of impact. Then test that for hold over at that distance.  



Edited by Urimaginaryfrnd - September/27/2018 at 23:31
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: September/28/2018 at 06:37
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Mil-dot ranging is not automatic... it takes a lot of study and practice to be consistently accurate.  It is what's known as a "fragile skill"... use it or lose it.  It is very useful and a skill worth having.  
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: October/11/2018 at 18:16
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Optics GrassHopper
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I think the easiest is to only use the magnification where the mils are accurate. Maybe use your variable option if you want to get a better look at something or back off of something.

I honestly don't see the purpose of those variable scopes. If budget restricts your purchase then a better option in my opinion is a fixed power. You get way more quality for your dollar.
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