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Putting mil rad marks on reticle

 
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  #1  
Old 02-27-2009, 08:40 PM
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Putting mil rad marks on reticle

My plan is to have dots put in my scope for the different yardages below the center crosshair. i can determine how far apart they will be in MOA. but i'd like to put some mil rads above center to have a backup ranging system. how far apart are these things in terms of MOA? have to confess i know nothing about mils.
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Old 02-27-2009, 08:59 PM
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Re: Putting mil rad marks on reticle

1 Mill at 100 yard substends 3.6" which is 3.348 MOA
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Old 02-27-2009, 10:38 PM
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Re: Putting mil rad marks on reticle

JWP, thank you very much, exactly what i needed.
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Old 02-28-2009, 12:14 AM
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Re: Putting mil rad marks on reticle

Dave why are you going to go with mildots for ranging? If you are going to use the dots only for range estimation, MOA dots would be a lot easier to do the math and dots set up in IPHY would be even easier to do than MOA.

David
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Old 02-28-2009, 11:07 PM
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Re: Putting mil rad marks on reticle

[QUOTE=dmgreene; If you are going to use the dots only for range estimation, MOA dots would be a lot easier to do the math and dots set up in IPHY would be even easier to do than MOA.

can you explain how to use moa and IPHY dots to range with and why IPHY is easier. i was looking mil rad and using a chart like Darrel Holland has on his reticle.
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Old 02-28-2009, 11:59 PM
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Re: Putting mil rad marks on reticle

am i right in assuming if i have IPHY dots and a 24"(assumed height) elk spaced exactly 3 dots, then the elk would be 800 yards?
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Old 03-01-2009, 01:05 AM
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Re: Putting mil rad marks on reticle

Dave lets say you have a target that is 16".

First MOA
You range the target and it is 4 moa. The math would be 16" divided by 4.188(the 4moa range reading x 1.047) equals 382 yards.
There is an easier way to do MOA. Since 1 moa is roughly 5 percent larger than 1 IPHY you can do the math like this: 16" divided by 4 = 400. Now subtract 5 yards for every 100 yards to make up for the extra 5 percent. So divide 400 by 100 which is 4. 4x5=20 So your finial range would be 400-20=380 yards. That is with in 2 yards of the correct reading and you can do this all in your head.

Now IPHY
To figure in IPHY all you have to do is divide the target size by you actual reading without having to worry about that extra 5 percent. You don't have to convert anything because you are working with inches with your target size and your ranging scale.

Examples: 16" target, range reading 4 IPHY (16 divided by 4) 400 yards
2 IPHY(16 divided by 2) 800 yards
3 IPHY(16 divided by 3) 533 yards

With 1 mil being 3.6" at 100 yards its hard to do the math in my head and a mil is very course. The TMR, MLR and GEN2 mil reticles are better with their 1/2 mil spacing. I have one Leupold with the TMR reticle that I set a ruler up at an exact 100 yards and then I dialed the scope down until the 1 mil spacing read 4". I made a non permanent mark on the power ring where this was at. Then I went fine tuned it by shooting a 650 yard target that was taking 10 moa of dial up with a 100 yard zero. I then dialed the scope back to zero and used the 2 1/2 mil mark for a hold over aiming point. Then I used the power ring to adjust the point of impact. When I got to the same point of impact as the 10 moa dial up, I made a permanent mark on the power ring. With the 1/2 mil spacing of TMR adjusted to read 2 moa I have basically got the same reticle as the Nightforce NP-R2.
If I were to build a scope it would definitely have IPHY adjustments and a IPHY reticle. It's just easier for my simple mind.
I hope this helps.

David
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