Take a slide rule to a gunfight??? Let's see if that's really a good idea!

“Mildot Master® ...a direct path to firing solutions.®” is a registered trademark of Mildot Enterprises. But is it true? Is the Mildot Master® really a direct path to firing solutions? By my definition, a direct path is one that goes directly from the input data, apparent size of the target in mills, to the output data, holdover in mills and windage in MOA. Nothing on a rifle scope measures, or is calibrated in, yards or inches. So any time spent in combat figuring out yardage or bullet drop in inches is a needless detour.

A quick glance at the Mildot Master® reveals that it is actually two slide rules, which must be operated one after the other for a total of four steps. The third step is flipping the device over to read one’s ballistic data and the fourth step is flipping it back over to input what one has memorized from the back of the device onto the second slide rule. So, to get from the input data, apparent size of the target in mills, to the output data, holdover in mills, one must meander through this four step process, learning all kinds of useless information about yardage and bullet drop along the way.

In their instructions, Mildot Enterprises says it is a three step process, but that is because their third step has the word “and” dividing two distinct steps. Also, they don’t mention the acrobatic skills one must possess to operate the device with one hand, since one’s left hand is supporting the rifle. If you are sitting in a tree or leaning out a window and you cannot reach your hip pocket from your shooting position, you will have to hold the Mildot Master® in your mouth while making your shot. If you drop your Mildot Master®, you’re screwed. Not only are you at a loss for sighting information, but your fingerprints are all over it. Even backward third world governments have the capability to round up the locals and fingerprint them. U.S. military snipers are expected to assassinate people in countries that have diplomatic relations with us and, hence, access to FBI fingerprint files.

There is actually a fifth step that Mildot Enterprises neglects to mention in their instructions, interpolating between the ballistic data for targets that are not on a hundred yard line. Conveniently, all of the examples given, both on their website (www.mildot.com) and in their instruction manual, just “happen” to be for targets at ranges evenly divisible by one hundred.

The ballistic data used for examples in the instructions for the Mildot Master® are as follows:


The first thing one notices about this chart is that they have the fine 50 yard increments on the wrong end. How much good does the 150 yard data really do anyone? Even with no interpolation at all, if one just used +2.1” for everything from 100 to 150 yards and 0.0” for everything from 150 yards to 200 yards, one would not be more than an inch off. The Aguilar System for Medium Range Sniping defines “medium-range” to be anything out to about 650 yards. There is not enough room on the back of the Mildot Master® for that much data in anything finer than 100 yard increments if the font size is large enough to be read in dim light.

The second thing one notices is that linear interpolation does not work. Suppose one has been given data in 100 yard increments and one has determined that the range is 150 yards. By interpolating between 2.1” and 0.0” one would estimate the 150 yard drop to be 1.0”, which is 56% of the actual value, 1.8”. That’s not very good. The Mildot Master® can be used for shots out to 2000 yards and the error in interpolating between the inches drop at 1900 yards and at 2000 yards could be significant.

Now consider the following chart:


It is the same data as above, but expressed in minutes of angle rather than inches. (For example: At 500 yards -9.7 = -50.7 / 5 / 1.047) Now let’s try linear interpolation on this data. The computer generated drop at 150 yards is +1.1 MOA and the linear interpolation estimate is 1.0 MOA. Too bad Mildot Enterprises didn’t print this chart instead!

So we see that it is a mistake to us a linear technique to interpolate data in inches, which are really quite curved, when one should interpolate the data in MOA, which are quite straight. But, because Mildot Enterprises prints their chart in inches of drop, it is natural for the user to interpolate the chart, that is, to insert the unmentioned fifth step after step three, when he has found the bullet drop in inches, not after step four, when he has found the MOA holdover. If the Mildot Master® had not taken him on this needless detour through such useless information as yardage to the target and inches of drop, he would have interpolated the final result, MOA holdover.

The Aguilar System for Medium Range Sniping goes directly from the input data, apparent size of the target in mills, to the output data, holdover in mills. No inaccuracies are introduced because there are only two steps: Measuring an object of known height and holding over on the target. For more accuracy, one can hold halfway between two mill-dots. Because the interpolation is done on the second and final step, it is much more accurate than interpolating the data in inches provided with one’s Mildot Master®.

Also, nothing on the Mildot Master® tells one anything about windage! So the Mildot Master® is not only an indirect path to firing solutions, it is an incomplete path to firing solutions. Since there is barely enough room on the back of a Mildot Master® for holdover data in 100 yard increments, dialing in windage using the information provided by the Mildot Master® requires an additional two or three steps and a separate data sheet.

By far the worst problem with the Mildot Master® is not that it is indirect (five steps to determine holdover) or incomplete (nothing about windage), but that it requires one to take one’s eyes off the target. Military snipers work in teams and, if they have a 20× spotting scope with a mil-dot reticule, the spotter can measure things and take all the time he needs to fiddle with his Mildot Master® while the shooter keeps the target in sight.

But civilian snipers work alone and there are real dangers with putting one’s rifle down. You might get dirt in the muzzle. The enemy might see you wiggling around. If you are firing from darkness into light (as you should be), the enemy will definitely see you when you turn your flashlight on to illuminate your Mildot Master®. But the biggest problem of all is that you may not be able to find your target again. Watch the movie Enemy At The Gates and imagine Vassili Zaitsev having to put his rifle down and monkey with a Mildot Master® after spotting a German sniper creeping through the rubble. That wouldn’t work. Enemy soldiers are like leprechauns – if you take your eyes off them for even a moment, they disappear.

While the Mildot Master® is sorely lacking in windage data, it allow one to estimate the effects of firing downwards at an angle, which may convince some people to buy it. When developing my system, I considered the problem of snipers firing downwards at their targets and dismissed it as unimportant for two reasons:

     1) For a civilian sniper (my target audience), climbing up to the roof of a building is tactical suicide because helicopters will shoot him and, when pursued, he will never get down in time to reach his getaway vehicle.

     2) Even from the top of a five story building, a 500 yard shot is only going to be off by a fraction of an inch. The panoramic view from the roof may seem impressive but, in reality, it is only a 2° angle.

However, military and police snipers can get on the roofs of buildings because they control the airspace overhead and, since they are not going to be pursued, they can fire almost straight down at targets on the street in front of them. A city block is about 176 yards (a tenth of a mile) and, from the roof of a five story building, that is a 5.7° angle. (Assuming 3.5 yards per story.) So, should military or police snipers buy a Mildot Master® for this reason? No. 5.7° angles have about as much effect on one’s shot as solar flares.

Far more people have been shot in the foot by snipers who thought it was important to hold under when firing downwards than have been missed by snipers who knew nothing at all about angles. My advice is that it doesn’t matter unless one is on a building of at least twenty-seven stories and is firing on targets less than two blocks away. If one does find oneself in this ridiculous position, just estimate the horizontal distance by how many blocks away the target is. The standard city block is 176 yards. They were smaller in the past, so the old part of town may have 100 yard blocks.

If one has a 12” length of fishing line with a lead sinker attached to one’s Mildot Master®, as is recommended in their instructions, my advice is to tie the fishing line to your wrist so you don’t drop the device out of a window. Ignore the angle graduations printed on the front of the Mildot Master®.

So, does this mean that the Mildot Master® is of no value and you should immediately throw your slide rule in the trash and buy a set of Sniper Flash Cards? No. While I do encourage you to immediately buy a set of Sniper Flash Cards, I’m not going to tell you that the Mildot Master® is valueless.

At the beginning of this review I said “Nothing on a rifle scope measures, or is calibrated in, yards or inches.” That is not entirely true. The Mark 4 by Leupold is available with dials calibrated in yards. They have two dials available: One for the Federal GM308M cartridge and one for the M118 military cartridge.1 Of course, a Mark 4 costs $2000, fully ten times the cost of the scope I recommend, the BSA 4-16× with an illuminated mil-dot reticule. But, since the Mark 4 is standard military issue and, more importantly, because military snipers always work in pairs so they don’t have to worry about taking their eyes off their target and/or dropping their device out of a window, the Mildot Master® actually works farely well for them.

The Aguilar System for Medium Range Sniping only works for targets of 44”, 72”, 76”, 80” and 84”. In urban combat, that pretty much covers it. In third world countries, all passenger cars and pickups are 44” from the bottom of the door to the roof. (In my system I say “sedans and hatchbacks” because Americans have such a fondness for gas guzzlers that I could not include SUVs and pickups.) A man of average height is 72”. Astro vans, Humvees and M113s from the ground to the roof are 72”, as is the hull and turret of a BRDM. The glass part of a glass and aluminum door and a tall, athletic man in combat boots and a kevlar helmet is 76”. Entry doors on houses are 80”, as are steel warehouse doors. Residential garage doors are 84”. The hull of a Dragoon Patroller or the hull and turret of a Bradley are also 84”. A BMP-2 is 84” from the ground to the top of the turret. Few, if any, modern military vehicles are larger than 84”. Some, mostly armored scout cars, have hulls that fall in the gap between 44” and 72”. If you are plagued with people driving scout cars, a Mildot Master® may be useful to you. Otherwise, Sniper Flash Cards should be sufficient.

The Aguilar System is designed for non-magnum deer rifles zeroed for 300 yards. This works for all standard deer rifles. It does not work for the AR-15 or for rifles chambered in .300 Win Mag, .338 Lapua or .50 BMG. Civilians, as a rule, do not have such weapons. If you’re into this exotic stuff, then my generic holdover and windage figures will not work for you. The Aguilar System for Medium-Range Sniping cannot be adapted to exotic calibers and handloads. The Mildot Master® can be used with any rifle, provided that your armorer supplies you with accurate ballistic data.

In conclusion, I would say that the The Aguilar System for Medium Range Sniping is unequivocally better than the Mildot Master® for people with non-magnum deer rifles. If you have an exotic caliber or handloads, the Mildot Master® may be better for you. But don’t get the idea that your rifle is “special” just because you’ve tweaked it a bit or are handloading your own ammunition. If you are using the same bullets that are used in commercial ammunition and you are staying within safe pressure limits, the Aguilar System should work just fine. If you’ve managed to stuff enough gunpowder into your handloads that they are significantly flatter shooting than factory loads, then ballistics is not your biggest worry. Your rifle is more likely to kill you than anybody else.

If you have the time and determination to walk around your city measuring things, the Mildot Master® is a useful supplement to the Aguilar System. Convenience stores, gas stations and fast food restaurants are everywhere and they all have exactly the same architecture and the same signs out front. If you assemble a database of measurements of signs and architectural features on buildings, the Mildot Master® can make use of this information.

Military sniper teams with ½ MOA rifles and Mark 4 scopes are satisfied with the Mildot Master®, but my target audience (civilians in North, Central and South America) would be better served with Sniper Flash Cards. While I cannot say they will win against a professional army, I will say this: A resolute man, capable of firing a deer rifle within five seconds of locating a target, and mounted on a “crotch rocket” motorcycle, cannot be captured.