Rifle Scopes moa conversion back to inches question

[M.D.K.]

Well I just purchased another varmint hunter reticled scope from Leupold and I was curious what the reticle's drop would be at 20x so I called leupold and they gave me the drop in MOA. This wouldn't be a problem except I have my bullet drop calculations in inches. I know how to conver inches to moa but not the other way around. If anyone could help that would be great. Here is the data:

300 yrds=1.48moa, 400 yrds=3.38moa, 500 yrds=5.75moa. I need these numbers ^^^^^^ in inches. thanks

 

[NukeMMC]

Re: moa conversion back to inches question

1moa = 1.047"

1.48moa = 1.55"
3.38moa = 3.54"
5.75moa = 6.02"

 

[M.D.K.]

Re: moa conversion back to inches question

Thanks for the helpNuke, I new what the moa conversion that you posted but for some reason I couldn't get it to add up at the yardage's I needed. I just figured out my mistake, when I was doing the inches x yards, I was forgetting to include the 1.047 moa. Thanks for the help!!!

 

[77Bronc]

Re: moa conversion back to inches question

As Nuke said above, use a ratio:

1 MOA X MOA
----- = ------ Fill in the X MOA and cross multiply
1.047" inches

Then solve for inches, vice versa if inches are known, solve for MOA

 

[kombar]

Re: moa conversion back to inches question

No. None of those values are correct.

Besides that, Leupold is almost certainly using inch-per-hundred-yards, not true MOA, so the calculation would be:

1.48"/100yd*300yd = 4.4"
3.38"/100yd*400yd = 13.5"
5.75"/100yd*500yd = 28.8"

 

[USW.260]

Re: moa conversion back to inches question

Kombar is right.

Leupold Does NOT calculate in the .047

 

[M.D.K.]

Re: moa conversion back to inches question

Kombar you are correct, after I pulled my head out of my ass and remembered how to do math again I was able to work it out, then I called Leupold again to varify my calc's and you are right.

 

[redirt78]

Re: moa conversion back to inches question

Ouch, now I'm not looking forward to trying to learn this stuff... I need a book, that makes it simple to understand. Any recommendations?

 

[sobrbiker883]

Re: moa conversion back to inches question

Fixed power MK4's and some other MK4's are moa.

 

[sscoyote]

Re: moa conversion back to inches question

<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: Kombar</div><div class="ubbcode-body">No. None of those values are correct.

Besides that, Leupold is almost certainly using inch-per-hundred-yards, not true MOA, so the calculation would be:

1.48"/100yd*300yd = 4.4"
3.38"/100yd*400yd = 13.5"
5.75"/100yd*500yd = 28.8" </div></div>

Not according to their catalog. On pg. 95 of the '10 catalog they list the exact total inch conversions (correctly calcd. BTW) of the MOA reticle stadia subtensions they advertise.

I.e. they advertise the "400-yd." VH stadia as 4.80 MOA and total inch subtension at that range as 20.11.

 

[sscoyote]

Re: moa conversion back to inches question

<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: redirt78</div><div class="ubbcode-body">Ouch, now I'm not looking forward to trying to learn this stuff... I need a book, that makes it simple to understand. Any recommendations? </div></div>

Try here--
http://specialtypistols.infopop.cc/Reticle_Ranging___App.pdf

Look out some window of your house and if u have any object of a known dimension laser back to your window and start playing around with the formulas. You will learn that--

1) Subtension is ~inversely proportional to magnification in 2nd focal plane reticles.

2) The mil-dot "mil-ranging" formula defines rangefinding and downrange zeroing with any multi-stadia reticle or turret.

Those are the two biggies really. The best way to learn it is by using a simple plex reticle in a 2nd FP optic, as it has 5 stadia points in it that can be used for all of the above-mentioned concpets.