Mildot/mrad turret math

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Hey everybody. I have a scope that uses MRAD turrets and a MILDOT reticle. I was wondering if anyone knows a mathematical formula I can use to get a rough idea on turret adjustments for different yardages.

I'll give an example. Say my scope is zeroed at 100 yrds and I'm shooting at a target at 300 yards. What math will I need to do to determine my turret elevation adjustment value. Or should I just look into a ballistic calculator or smartphone app to help with the math.

If I'm confusing anyone feel free to ask questions as I may have made my question a little confusing.

(I plan on keeping a detailed card with power, elevation value, etc. with my gun once I get it figured out at 100 yard increments to make it a little easier in the field. I just wanted some math to help aid the set up process.)
 
First off it it good that your scope has matching reticle and turrets. Secondly you need to know how much your bullet is going to drop at a given distance to convert it to mils. However, most calculators which will give you a drop value in inches will also be able to give you a value in mils just as easily to save you the math.
 
One easy way without math is to zero at 100m , don't change your elevation.
Then shoot at 200m look through the scope measure the amount of drop in mils using the reticule and this is what you'll need to come up if you wanted to zero your reticule at 200m, write it down in your data book. you can repeat this at farther ranges as long as you can see your poi.

Real world numbers are more important then calculator predictions , especially if you don't know specifics like muzzle velocity etc... it will have quite a bit of potential for error, it's kind like garbage in ,garbage out type of scenario
 
There is no need to do calculations. There are plenty of good ballistics calculators out there that will give you your drops at any distance. JBM ballistics calculator is one of the best:

http://www.jbmballistics.com/cgi-bin/jbmtraj-5.1.cgi

Choose you bullet (ones with "Litz" are the better models), and select mils for the output.

The output will match the "real world" values if you feed the program with good data (accurate muzzle velocity, environmental conditions, scope height, etc...).
 
Based on the website I'm gonna go with a second focal plane. It only lists the 6-24x as a first focal and I'm using an 8-32. The full model is a Sightron SIII SS 8-32x56mm LRMD
 
what type of shooting are you planning on doing?

today's range math is mostly about figuring out distances, its based in the size on target and how many mils it is when measured by the reticule .

it's not about determining the amount of elevation on the fly, this you'll all ready need to know or input in to a ballistics calculator providing you have good info to feed it, that is unless your trying to go old school and do everything with out electronics.

in that case I do not know the formulas needed to change muzzle velocity , BC , temperature, humidity and air density in to mils of elevation I'm sure the info is out there though.
 
caustic said:
what type of shooting are you planning on doing?

today's range math is mostly about figuring out distances, its based in the size on target and how many mils it is when measured by the reticule .

it's not about determining the amount of elevation on the fly
Click to expand...

I've yet to sight in my rifle, so what I had planned on doing was having my notes something similar to this.

Yards Magnification Elevation
@100YRDS - 8X - Zero
@200YRDS - 12X - +2
@300YRDS - 16X - +6
Etc, Etc.

Thats basically my thoughts as to how I was going to have this setup. I was just wondering if there was math that could make it a little easier when sighting from my zero to the 100 yard increments to save a few rounds and headache was all. Through practice I'll be able to make minor adjustments on the fly but for the most part all long shots, say over 500YRDS will be on paper. I'll have plenty of math time on the range.
 
your scope is second focal plan, the retical is indexed at 24x magnifcation...

if your asking about how to determine bullet drop at a certain range... then the math is much more complicated then youd like to do- elevation, temp, air density, humidty, bullet BC, bullet velocity etc etc all have an effect.. you can 1) use a ballistic calculator, 2) shoot at targets at knowen distance, and write down the info needed


if you plan to dial for range.. dial as normal and shoot, if you plan to use hold overs, then it will only be correct at 24x mag...
 
for my initial sighting I start at 25m , pull my bolt look through the barrel bore at the target, then center target in bore try not to move rifle after this. then look through the scope line up the cross hairs on target via elevation and windage, verify that my bore is still lined up with the target and also verify the reticule is this line and on target. this is a basic bore sight.

this will get you on paper , quite close to the bulls eye actually. I then shoot 25m, adj turrets move back to 100 shoot adjust and done. might take 10rds total.

side note:

one thing to remember is that with SFP the reticule sub-tensions are only correct at the magnification they are set for usually max power.

this only matters if your using them for hold overs / leads. if so that is when "range" math (ie: shooting range math) will come in , as at half power the sub-tensions with be x2 etc...
 
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