A quick but thorough overview & instructional
by. Tres MonCeret
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The Mildot master is a wonderful tool that does all the long calculator work for you in an instant. It is simply a slide rule analog calculator. For the Long range shooter it is a God send. It is lightning fast at giving range, required elevation for the shot in EITHER Minutes or Mils, information for wind compensation and more, all REALLY quick.
1 Using the MDM to determine range: Line up the size of the target in mils with the size in inches of the slide rule. Read the number @ the TARGET RANGE arrow.
Example: Looking at a Stop Sign (30”) through the mil reticle we observe it to be 1.8 mils tall. On the MDM we line up the 30” mark in the window just ever so slightly above the 1.75mil line by the reticle illustration. Now looking over at the Target Range Arrow we read about 470 yds. That's our range!
2.Determine required elevation for proper hold or correction: (this requires printing off a simple data card “strip” with only inches of drop per hundred yards as well as inches of drift per C yards and taping it to the back side of the MDM.) Let’s stop and set up a very simple data card with only drop in inches, wind drift in inches, as well as lead in inches for a classic .30-06 load to use for the rest of our MDM training. See below. So we already determined our range to be about 470yds. and we have the slide rule of the MDM lined up. Now we need to refer to our simple data card to see how much our bullet will drop @ 470. See the data card below: it would normally be affixed to the back side of the MDM.
1. The point of the MDM is SPEED & ease of use, and we can get away with coarse estimations at 470 yards since it not super long range. So looking at the data card Iʼm just going to go with quick 44” educated guess** for drop at 470 yards since we are between two printed lines of the card.
So now looking at the MDM, making sure the slide has not moved on us we look for the 44” mark in the “Bullet Drop” window. We see it lines up with about 8.8moa on the left and about 2.6 mils on the right. Viola! Thereʼs your required hold over or elevation correction to hit this 470 target in either Mils or Moa.
Donʼt stop there- the MDM will instantly give us our wind correction.
3 Finding our windage solution: Letʼs say we have a 2mph FV wind on this shot. Again looking at our little data card Iʼm going to quickly estimate** a 12” wind drift per 1 mph of wind. This shot has a 2mph wind, so The bullet will drift 24” for this shot. Got back to the “bullet drop” column and find 24.” Read left for MOA or right for MIls and thereʼs your correction for wind on this shot! Neat! But donʼt stop there!
4Finding required lead for a mover: Letʼs say itʼs a moving target, say a 6mph trotter. Make sure the slide still has not moved off the 470yard mark. Look again at the little data card and figure the lead required in inches for a 6mph mover @ 470yards. Iʼm again going to quickly assume** 66.” Find 66” in the Bullet Drop window. Presto! We see we need a 3.9 MIL lead!
How cool is that? The MDM is fast fast fast! With just a little practice you can go from looking at a target through your reticle to having the yardage, needed elevation, needed windage, and lead required for the shot in a few seconds flat. Every serious field shooter has a MilDot- Master. Get your's today here.
2 ** The MDM is perfectly accurate- as accurate as your range card, that is to say the MDM is as accurate as the info you feed it. Had I done a proper, albeit slower mathematical interpolation to get perfect data between the printed lines of the card for this for the 470yds used in this illustration the MDM would have given me a perfect, instead of “guesstimated” firing solution.
But the MDM does more still yet.
5. Correction for inclined fire: (on the backside of the MDM youʼll see an arrow that points to a corner hole labeled “Pivot.” Youʼll need to thread a weighted string through the hole to read the degrees of the inclined shot.)
Look down the top edge of the MDM carefully( **from near the height of your rifles muzzle.** )
Carefully turn your head and note the printed degreeʼs on the MDM that the string is indicating. Letʼs say we get a reading of 40 degrees.
Turn the MDM back over and make sure the slide has not moved off of our 470yds at the Target Range arrow.
Youʼll notice there are other lines below the Target Range arrow line marked in degrees. This is for inclined fire. While our 470 yards we worked out earlier is still on the Target Arrow line, read the yardage at the 40degree mark = 360 yards.
So even though we reticle ranged this target to be 470 yards, we need to set our elevation as if the shot were 360yards so we will hit dead on. So back to the data card to find our inches of drop for 360 yards. Then we reset 360 yards to line up with TARGET RANGE arrow. Then... well you know how & what to do next at this point.... **(I have observed a lot of people who will stand upright, dope the slope of the inclined shot, then lay down in the low prone position and attempt to make the shot. This alters the angle and at long range can introduce enough error for a clean miss at Long Range.)**
And last but not least: “Tape Measure”
What Iʼm going to describe next is neat as well.
Let me explain.
Say your deer hunting. Thereʼs not much action and your bored to tears. Your looking around and off in the distance you see a nice Walnut tree. You have been thinking youʼd like to cut a Walnut tree and have the main beam made into a beautiful mantle to go over your fire place. Hmm, is the trunk of this one big enough in diameter to make the mantle piece?
Well, if we have our Mil reticle, Laser Range finder, and MDM we can measure the diameter of the tree with good accuracy from where we sit. Hereʼs how:
1. Use the Laser to get the yardage to the tree. Letʼs say itʼs 220 yards. Set the slide rule of the MDM to 220yards at the Target Range arrow.2. Looking through the scope use the mil reticle to see how wide the trunk of the walnut is in mils. Letʼs say that the trunk is 3 mils wide as viewed through the scopes reticle. Find 3 mils on the reticle illustration of the MDM. Follow the line right right to the 24” in the Target Size window. The trunk of the tree is just a tad shy of 24” in diameter. That would make a nice mantle piece. Pretty neat.
How many people do you know that can measure the diameter of a tree trunk that is 220 yards away? We just did! I have measured countless items this way at range, but most commonly I have measured the inside spread of a deerʼs antlers- at range.
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