Determining Size of A Target Using MOA?

[killemall419]

I was going through the tutorial on shooterready on ranging with an MOA reticle, and the second section mentions that you can determine the size of a target if the range is known. In the example, they give a target of unknown size, and they tell me that the target is at 700 yards. They tell me that the answer is 48 if I ask for help from them. However, they don't tell me how they come up with the answer, or an equation to determine said answer. Is there anyone that can tell me the equation to determine the size of a target when the range is known, using an MOA reticle?

[Dhena81]

I believe its just Division 48/7 = approx 6.85 MOA or about 7 MOA so if your target is at 700 yards and taking up 7 MOA its 49"

I could be wrong because I don't have much experience in this I just shoot and adjust.

[V]

A minute of angle is an inch per hundred yards (approx).

So I work it out from simply following that definition through...

size of object in inches / size of object in moa = distance in hundreds of yards

So work out for your unknown if
xx inch object / 4 moa it appears to be = 5 one hundred yards means its a 20 inch object.

20 inch object / 4 moa it appears means its 5 one hundred yards away.

If you simply want your formula

size in moa x distance in yards / 100 = size in inches

[mixicus]

The equation is:
(Size of target in inches/MOA measurement) x 100 = Range in Yards

Solve for the unknown variable.

So...if you know the target is 700yards away and is 7MOA wide it is an 49" wide target.

FYI: MOA is ~1" at 100yards (actually 1.047" at 100yards)

[bubbapug1]

try doing thst with mil rads and tell me moa is tougher....its not. You also can use moa to determine range if you know the target size and have a know moa gradient on the reticle.

[Damn True]

You can also work this the other way for range, even with a duplex http://www.longrangehunting.com/arti...reticles-1.php

[HonkingAntelope]

The equation is:
(Size of target in inches/MOA measurement) x 100 = Range in Yards

Solve for the unknown variable.

So...if you know the target is 700yards away and is 7MOA wide it is an 49" wide target.

FYI: MOA is ~1" at 100yards (actually 1.047" at 100yards)

Another thing to keep in mind is that some scopes click "true" MOA (1.047" @ 100yds), while quite a few others click in Shooters' MOA, which is rounded down to exactly 1" @ 100yds

[CSACANNONEER]

You are just descibing measuring by stadia and using a reticle as a crutch. I suggest that you try to first understand how stadia measurements work. Then, it should be very easy for you to understand how to use a MOA reticle or any other crutch to get a fairly good measurement.

[klewan]

I always thought it was you knew the size of the target; people, deer, sheep, etc. and you calculate the range from that.

[chino]

(Object size in yards x 1000)/mil =range in yards therefore

(range in yards x mil)/1000 = object height in yards

In your exercise you were ~1.9 mil

[killshot44]

Reticles aren't a "crutch", they're a tool to be used.
Not everyone shoots on a KD range.....

[killemall419]

Lmao. Wow, once you all lay it out so simple, it makes perfect sense, lol. I was over thinking it I guess you could say. Thanks for the explanations and equations.

[Renaissance Redneck]

I always thought it was you knew the size of the target; people, deer, sheep, etc. and you calculate the range from that.

Sure, that's a common application of the principle. But, it can be used "the other way", as the OP suggests. Depends upon what you're trying to accomplish.