Re: This is how you do range math Check it out
So...just add 10% for meters to yards, and vice versa. Easier for me.
So...just add 10% for meters to yards, and vice versa. Easier for me.
Re: This is how you do range math Check it out
<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: CoryT</div><div class="ubbcode-body">Could I just stick with + or - 10 percent? I'm math challenged.
300 meters + 10% = 330 yards
600 yards - 10% = 540 meters
Seems close enough for government work
</div></div>
I use this method.
<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: CoryT</div><div class="ubbcode-body">Could I just stick with + or - 10 percent? I'm math challenged.
300 meters + 10% = 330 yards
600 yards - 10% = 540 meters
Seems close enough for government work
</div></div>
I use this method.
Re: This is how you do range math Check it out
<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: Chappy76</div><div class="ubbcode-body">this should be a sticky</div></div>
+1 for a sticky
<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: Chappy76</div><div class="ubbcode-body">this should be a sticky</div></div>
+1 for a sticky
Re: This is how you do range math Check it out
<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: TiroFijo</div><div class="ubbcode-body">All I can say is life is tought for the US customary system users...
My system is like this:
measure objects AND range in meters (whoa! <span style="font-style: italic">same units for both</span>, and <span style="font-style: italic">decimal</span>, what a concept!)
<span style="color: #FFFF00">then: target size * 1000 / mil reading = range</span>
done
it is also nice that (since metric units are <span style="font-style: italic">decimal</span>) they correlate exactly with mils:
0.1 mil (aka 1 click) = 1 cm at 100 m
10 mils (aka as "head to crotch") = 1 m at 100 m </div></div>
New guy to distance shooting.
How do you determine target size?
AND
Does anyone use the "Mildot Master" ?
Mildot master
<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: TiroFijo</div><div class="ubbcode-body">All I can say is life is tought for the US customary system users...
My system is like this:
measure objects AND range in meters (whoa! <span style="font-style: italic">same units for both</span>, and <span style="font-style: italic">decimal</span>, what a concept!)
<span style="color: #FFFF00">then: target size * 1000 / mil reading = range</span>
done
it is also nice that (since metric units are <span style="font-style: italic">decimal</span>) they correlate exactly with mils:
0.1 mil (aka 1 click) = 1 cm at 100 m
10 mils (aka as "head to crotch") = 1 m at 100 m </div></div>
New guy to distance shooting.
How do you determine target size?
AND
Does anyone use the "Mildot Master" ?
Mildot master
Re: This is how you do range math Check it out
<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: Glock30</div><div class="ubbcode-body">
New guy to distance shooting.
How do you determine target size?
AND
Does anyone use the "Mildot Master" ?
Mildot master </div></div>
Sir, go to this link http://www.tracearmory.com/gear.html and you will see why the mil-Dot master is a key tool to own and use.
John
<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: Glock30</div><div class="ubbcode-body">
New guy to distance shooting.
How do you determine target size?
AND
Does anyone use the "Mildot Master" ?
Mildot master </div></div>
Sir, go to this link http://www.tracearmory.com/gear.html and you will see why the mil-Dot master is a key tool to own and use.
John
Re: This is how you do range math Check it out
Thats great! Thank you J.Boyette for posting that formula. As a new long distance shooter this site is unbelievable for the sheer volume of information available.
Thats great! Thank you J.Boyette for posting that formula. As a new long distance shooter this site is unbelievable for the sheer volume of information available.
Re: This is how you do range math Check it out
Funny, I was doing some range math myself and thought I had come up with a magic formula for my buddy and I to attempt some REALLY long range shots at antelope...but I see that someone on this thread has already mentioned it...kinda. Its the 27.77 magic number. BUT he should have mentioned that that ASSUMES you have your scope set to 25x power. Anyway we were attempting to avoid having to fork out the BIG bucks for the Geovid range finder. Here for you late night reading is my analysis.
Initially I derived a REALLY cool equation that is easy to remember and is 98% accurate: Distance_In_Meters = Scope_Power * Target_Size_Inches / MILS_Spanned. I was ASSUMING that we could just zoom our 8.5x to 25x scopes until our target of known size spanned some easy to read MIL amount, read the scope power and accurately determine the distance. The problem was our Leupold Mark 4 target scopes, while truly 8.5 to 25x, didn't precisely have the mid ranges stamped on the scope tube. Also, I could obtain my best MILs span measurements at the 25x power anyway. So I modified my equation to ASSUME 25x and compute range in Yards as opposed to Meters (This is AMERICA after all). The modified equation is 100% accurate ASSUMING you can measure the MILs span perfectly! So this equation has a constant you need to remember: 27.78. The equation is: Distance_In_Yards = 27.78 * Target_Size_Inches / MILs_Spanned. Cool!!! and it was very accurate out to 500yards or so. So could my friend and I save the $2500 for the Geovid range finder?
Let’s take an example: a 40” antelope is standing 1283 Yards away. A typical shot worthy antelope is 40" ground to shoulder.
Solving the 100% equation above for MILS = 27.78 * 40 / 1283 we get 0.866 MILs
No one will measure that!…Assume we measure 0.9 MILs at 25x on the scope.
Plugging that into the equation to figure distance in Yards = 27.78 * 40 / 0.9 = 1234.6 Yards.
Looking at the ballistics tables, the 300WM with 210gr bullet will have the following drops at yardages:
o 1234 yards = -500 inches
o 1283 yards = -550 inches
So we would miss-predict the drop by 50 inches on a 40 inch antelope. (Clean miss !)
So in the end, we will need to fork over the $2500 for the Geovid range finder, because with each yard of distance at 1200yards, the bullet drops and inch ( THIS IS WITH A 300WM ) or, we will need to continue to take "ethical shots" at a much closer distance...anyway. It would be cool to someday drop an antelope at over 1000yrds in one shot.
Its only rocket surgery.
Funny, I was doing some range math myself and thought I had come up with a magic formula for my buddy and I to attempt some REALLY long range shots at antelope...but I see that someone on this thread has already mentioned it...kinda. Its the 27.77 magic number. BUT he should have mentioned that that ASSUMES you have your scope set to 25x power. Anyway we were attempting to avoid having to fork out the BIG bucks for the Geovid range finder. Here for you late night reading is my analysis.
Initially I derived a REALLY cool equation that is easy to remember and is 98% accurate: Distance_In_Meters = Scope_Power * Target_Size_Inches / MILS_Spanned. I was ASSUMING that we could just zoom our 8.5x to 25x scopes until our target of known size spanned some easy to read MIL amount, read the scope power and accurately determine the distance. The problem was our Leupold Mark 4 target scopes, while truly 8.5 to 25x, didn't precisely have the mid ranges stamped on the scope tube. Also, I could obtain my best MILs span measurements at the 25x power anyway. So I modified my equation to ASSUME 25x and compute range in Yards as opposed to Meters (This is AMERICA after all). The modified equation is 100% accurate ASSUMING you can measure the MILs span perfectly! So this equation has a constant you need to remember: 27.78. The equation is: Distance_In_Yards = 27.78 * Target_Size_Inches / MILs_Spanned. Cool!!! and it was very accurate out to 500yards or so. So could my friend and I save the $2500 for the Geovid range finder?
Let’s take an example: a 40” antelope is standing 1283 Yards away. A typical shot worthy antelope is 40" ground to shoulder.
Solving the 100% equation above for MILS = 27.78 * 40 / 1283 we get 0.866 MILs
No one will measure that!…Assume we measure 0.9 MILs at 25x on the scope.
Plugging that into the equation to figure distance in Yards = 27.78 * 40 / 0.9 = 1234.6 Yards.
Looking at the ballistics tables, the 300WM with 210gr bullet will have the following drops at yardages:
o 1234 yards = -500 inches
o 1283 yards = -550 inches
So we would miss-predict the drop by 50 inches on a 40 inch antelope. (Clean miss !)
So in the end, we will need to fork over the $2500 for the Geovid range finder, because with each yard of distance at 1200yards, the bullet drops and inch ( THIS IS WITH A 300WM ) or, we will need to continue to take "ethical shots" at a much closer distance...anyway. It would be cool to someday drop an antelope at over 1000yrds in one shot.
Its only rocket surgery.
Re: This is how you do range math Check it out
Hey John it's been some time for me you always hit a home run with your ability to describe things on the computer. If you are a knucle dragger like me,I carry a sniper data book which makes things very simple and accurate with all of your necessary formulas and range conversion charts. I got mine from Iron Brigade Armory also a handy tool is a Mil-Dot Range Master. They're excellant tools.
Hey John it's been some time for me you always hit a home run with your ability to describe things on the computer. If you are a knucle dragger like me,I carry a sniper data book which makes things very simple and accurate with all of your necessary formulas and range conversion charts. I got mine from Iron Brigade Armory also a handy tool is a Mil-Dot Range Master. They're excellant tools.
Re: This is how you do range math Check it out
You just made ranging with my Mil dot Valdada IOR way faster for me. Thanks!!!
You just made ranging with my Mil dot Valdada IOR way faster for me. Thanks!!!
Re: This is how you do range math Check it out
I'm glad this makes sense to someone
Maybe I should throw away my range finder
I'm glad this makes sense to someone
Maybe I should throw away my range finder
Re: This is how you do range math Check it out
Another newbie, I enjoy learning the math involved. This thread has made me really understand it a lot more. Thanks everyone
Another newbie, I enjoy learning the math involved. This thread has made me really understand it a lot more. Thanks everyone
Re: This is how you do range math Check it out
I often like to approximate the Yards to Meters by first determining the feet in a meter as:
feet = meters * 5 /( e root (pi))
then just divide that number by 3 to get yards.
I often like to approximate the Yards to Meters by first determining the feet in a meter as:
feet = meters * 5 /( e root (pi))
then just divide that number by 3 to get yards.
Re: This is how you do range math Check it out
<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: TiroFijo</div><div class="ubbcode-body">My system is like this:
measure objects AND range in meters (whoa! <span style="font-style: italic">same units for both</span>, and <span style="font-style: italic">decimal</span>, what a concept!)
then: target size * 1000 / mil reading = range
done
it is also nice that (since metric units are <span style="font-style: italic">decimal</span>) they correlate exactly with mils:
0.1 mil (aka 1 click) = 1 cm at 100 m
10 mils (aka as "head to crotch") = 1 m at 100 m </div></div>
I think that sniper's hide is the first shooting forum.
I always read it but never write, for me is not simple write in english , I am italian and I studied English only at school, a very basic english, but work in decimal system is part of my life.
Excuse me for write error.
Usually in range mildot formula in decimal sistem we use:
dimension obj in meter * 1000 / nr mils on target = distance
example: my target is hight 1,8 m and the mils dot cover it with 3 dot
1,8 m * 1000 / 3 =
1800 mm /3 = 600 meters
In decimal sistem 1,8 meters are equals at 18 decimeters; 180 centimeters; 1800 millimeters,
for this reason 1,8 m * 1000 is equal at 1800 millimeters
In range mild dot formula is more easy if we use immediatly the hight target dimension in millimeters. It is very easy:
1,6 meters = 1600 millimeters
1,769 meters = 1769 millimiters
0,54 meters = 540 millimeters
easy
So, when you use the mildot formula:
hight target in millimiters / nr mils cover it = distance
my obj is hight 1,56 meters = 1560 millimeters
3 mildots cover it
1560 / 3 = 520 meters
one mathematics operations less.
Like in quote: 10 mils (aka as "head to crotch") = 1 m at 100 m
not exactly
10 mils aren't 1 meter at 100 meters
The correct:
1 mil = 10 centimeters at 100 meters or 0,1 meters at 100 meters
1 mil = 100 centimers at 1000 meters or 1 meter at 1000 meters (1 kilometers)
0,1 mils (turret click)= 1 centimeters at 100 meters or 0,01 meters at 100 meters
0,1 mils (turret click)= 10 centimeters at 1000 meters or 0,10 meters at 1000 meters
<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: TiroFijo</div><div class="ubbcode-body">My system is like this:
measure objects AND range in meters (whoa! <span style="font-style: italic">same units for both</span>, and <span style="font-style: italic">decimal</span>, what a concept!)
then: target size * 1000 / mil reading = range
done
it is also nice that (since metric units are <span style="font-style: italic">decimal</span>) they correlate exactly with mils:
0.1 mil (aka 1 click) = 1 cm at 100 m
10 mils (aka as "head to crotch") = 1 m at 100 m </div></div>
I think that sniper's hide is the first shooting forum.
I always read it but never write, for me is not simple write in english , I am italian and I studied English only at school, a very basic english, but work in decimal system is part of my life.
Excuse me for write error.
Usually in range mildot formula in decimal sistem we use:
dimension obj in meter * 1000 / nr mils on target = distance
example: my target is hight 1,8 m and the mils dot cover it with 3 dot
1,8 m * 1000 / 3 =
1800 mm /3 = 600 meters
In decimal sistem 1,8 meters are equals at 18 decimeters; 180 centimeters; 1800 millimeters,
for this reason 1,8 m * 1000 is equal at 1800 millimeters
In range mild dot formula is more easy if we use immediatly the hight target dimension in millimeters. It is very easy:
1,6 meters = 1600 millimeters
1,769 meters = 1769 millimiters
0,54 meters = 540 millimeters
easy
So, when you use the mildot formula:
hight target in millimiters / nr mils cover it = distance
my obj is hight 1,56 meters = 1560 millimeters
3 mildots cover it
1560 / 3 = 520 meters
one mathematics operations less.
Like in quote: 10 mils (aka as "head to crotch") = 1 m at 100 m
not exactly
10 mils aren't 1 meter at 100 meters
The correct:
1 mil = 10 centimeters at 100 meters or 0,1 meters at 100 meters
1 mil = 100 centimers at 1000 meters or 1 meter at 1000 meters (1 kilometers)
0,1 mils (turret click)= 1 centimeters at 100 meters or 0,01 meters at 100 meters
0,1 mils (turret click)= 10 centimeters at 1000 meters or 0,10 meters at 1000 meters
Re: This is how you do range math Check it out
dangedan87,
Nice summary sheet, but that last line should read "1 MOA = 1.047..." not 1 MIL.
Otherwise, looks good.
dangedan87,
Nice summary sheet, but that last line should read "1 MOA = 1.047..." not 1 MIL.
Otherwise, looks good.
Re: This is how you do range math Check it out
<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: SnakeEyes</div><div class="ubbcode-body">dangedan87,
Nice summary sheet, but that last line should read "1 MOA = 1.047..." not 1 MIL.
Otherwise, looks good. </div></div>
Yeah, I know. I got distracted with all the "MILS" haha
<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: SnakeEyes</div><div class="ubbcode-body">dangedan87,
Nice summary sheet, but that last line should read "1 MOA = 1.047..." not 1 MIL.
Otherwise, looks good. </div></div>
Yeah, I know. I got distracted with all the "MILS" haha
...Or you could just +- 10% for yards to meters, meters to yards. Want to be more precise, do 9%. Of course, multiplying and dividing triple digit numbers by 9 isn't as easy as 10, so in the field when converting yards to meters and meters to yards I just use 10%.
For milling I don't use any math at all because I built a simple chart which I keep in my databook. One column has all the mils (0-10) in 0.10 increments (the most accurate I can mil at the present) and the other column has the target heights: 6" to 6ft. Voila, no math needed.
For milling I don't use any math at all because I built a simple chart which I keep in my databook. One column has all the mils (0-10) in 0.10 increments (the most accurate I can mil at the present) and the other column has the target heights: 6" to 6ft. Voila, no math needed.
Last edited:
This is one of those gems needing a bump to the top.
For me, converting meters to yards is +10%
To convert yards to meters subtract 10% and add back 1%
Example: 100 meters is as close as close gets to 110 yds. Think of high school track if you ran the yards system and now run meters
If you subract 10% of 110 you come up with 11...add back 1% and you have 100 meters.
100 yards minus 10% =90, add back one and you have 91. Close enough as 100 yds. =91.44 meters.
For me, converting meters to yards is +10%
To convert yards to meters subtract 10% and add back 1%
Example: 100 meters is as close as close gets to 110 yds. Think of high school track if you ran the yards system and now run meters
If you subract 10% of 110 you come up with 11...add back 1% and you have 100 meters.
100 yards minus 10% =90, add back one and you have 91. Close enough as 100 yds. =91.44 meters.
This is cool however I don't find myself needing to go from meters to yards or vice versa I range in yards and figure a firing solution for my target..
And what happens when you don't have a laser rangefinder but are given a distance in meters? That's why we (try to) keep our brains sharp on math. ?
1 mil = 3.6 inches. There are several common versions, 3.6 is close enough.
1 moa = 1.047 inches, 1 inch is close enough
1 mil equals 3.43 moa; 3.4 is close enough
1 moa = 0.29 mils; 0.3 is close enough. If you have a scope with MOA turrets and you need to go up a mil, three clicks up and hold over a bit. Half a mil is up two clicks and hold a bit under.
1 mil at 1,000 yards is 36 inches; 1 mil round plate center to edge is 0.5 mils. With a left-to-right wind, you fire and miss a 1 mil plate just off the plate to the right, hold left edge (or dial half a mil) and reengage; expect center hit, call your shot. If windage is good but you hit just under, hold top edge (or dial half a mil) and reengage; expect center hit, call your shot.
at 500 yards, an 18x24 steel silhouette is 1 mil (3.4 MOA) wide and 1.5 mils (5.1 MOA) high
at 500 yards, a human head is 1/3 of a mil (1.1 MOA) wide and half a mil (1.7 MOA) high.
If you are shooting a 308 at 1,000 yards with:
1 moa = 1.047 inches, 1 inch is close enough
1 mil equals 3.43 moa; 3.4 is close enough
1 moa = 0.29 mils; 0.3 is close enough. If you have a scope with MOA turrets and you need to go up a mil, three clicks up and hold over a bit. Half a mil is up two clicks and hold a bit under.
1 mil at 1,000 yards is 36 inches; 1 mil round plate center to edge is 0.5 mils. With a left-to-right wind, you fire and miss a 1 mil plate just off the plate to the right, hold left edge (or dial half a mil) and reengage; expect center hit, call your shot. If windage is good but you hit just under, hold top edge (or dial half a mil) and reengage; expect center hit, call your shot.
at 500 yards, an 18x24 steel silhouette is 1 mil (3.4 MOA) wide and 1.5 mils (5.1 MOA) high
at 500 yards, a human head is 1/3 of a mil (1.1 MOA) wide and half a mil (1.7 MOA) high.
If you are shooting a 308 at 1,000 yards with:
- 4 MPH full value wind, hold 1.2 mils (4.1 MOA) into the wind.
- 8 MPH full value, hold 2.4 mils (8.2 MOA).
- 8 MPH wind from 1:30 o'clock, hold 1.7 mils (5.8 MOA).
- 8 MPH at 1 o'clock, 1.2 mils (4.1 MOA).
- If wind flags are 10 feet or more above the ground, assume bullet-level wind is between 1/4 and 1/2 of the flag value - check veg.
i find this extremely confusing whats with <span style="font-weight: bold" >5</span> "<span style="font-weight: bold">5</span>00 meters" x 9 = 45 drop the two 00 in 5<span style="font-weight: bold">00</span> and insert the 45 for 545yds <span style="font-weight>bold">5</span> "<span style="font-weight: bold">5</span>00 meters" x 9 = 45 drop the two 00 in 5<span style="font-weight: bold">00</span> and insert the 45 for 545yds seeems like its in computer programmer code?
Because the site has been through four iterations since the posting you refer to. Each time it changes, the code of the old stuff shows up.
