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Mil-Dot vs BDC: Considerations for a DMR Part 2

Mil-Dot vs BDC: Considerations for a DMR Part 2

So which one is best? This is not a compare and contrast. That has been done a thousand times. No need to dig deep into the common talking points as this article is not a primer… It’s a collection of thoughts that look into each system and why you should choose one over the other.

I personally believe that a rifleman should cultivate skills that promote speed on target… and that in any given scenario a rifleman may encounter (be it hunting, self-defense, or SHTF) he/she will be presented with a target at unknown distance with the variables of time, stress, and environment working against him/her. It’s important that we cultivate shooters who can respond from point-blank to 600 yards with accurate, timely fire. Can a rifleman accomplish this with a 4-14 mil/mil scope? Of course. Can he accomplish this with a ACOG? Of course. Both can give excellent results with an accomplished shooter. The choice between the mil system over the BDC system comes down to a series of compromises. Let’s touch on these topics:

Atibal velocity barrel

Time Vs Training

You got kids? Get to the range once in a blue moon? Compete? Or are you single with a disposable income and plenty of time to hit up courses and shoot? The practical aspects of life should also drive your gear selection. Me? I am the former. With a growing family I have less time to shoot, less time to compete, and have to consider gear in a different way. If your time is precious, a fixed BDC system may be the best option for you. Having a bullet and reticle matched system makes sense if you don’t have lots of time for the deeper learning curve of the mil system. A good BDC reticle will have several tools on board to allow you to range, hold for wind, and to match your drop. Are they perfect? No, they are limited… but in some cases so is our time. Having the ability to pick up a rifle after months and hit targets from 0-700 yards with a single load / optic is no joke… but do the limitations of BDC impair the rifleman?

ACSS reticle

The ACSS system on the now discontinued PAC4X

Naysayers will come up with some very good counter-points. The mil-dot optic and variants are like a toolbox for the shooter. The ability to semi-precisely range a target, and then dial in the drop and wind drastically increase hit probability. At extended distance, range error calculation and wind calls are the biggest variables a shooter must solve. It’s absolutely true, if you can keep up proficiency with the mil-dot system, then you have many advantages over a BDC rifleman as far as first round hit. Add a range finder and up goes your percentage. Add a kestrel and up goes your percentage. Add a… Wait. Do you see where I am going here? Does a rifleman really have time for that?

One Rifleman’s Reality:

Chris Hernandez

The perfect example of a rifleman in practice would be my relative Chris Hernandez. You can read his stories on his own blog at www.chrishernandezauthor.com and if you dig deep enough you can find his experience with the DMR to be a bit eye-opening.

Second thing: For most modern combat, 300 meters is plenty far. I carried an M14EBR (Enhanced Battle Rifle) in Afghanistan, and I could consistently hit a torso-sized rock at 900 meters – at the range, with perfect weather conditions, a good firing position, on a stationary target at a known distance. In combat, with extreme heat or cold, unknown distances, hasty firing positions, adrenaline and moving targets, plus little annoyances like incoming fire, I would have been ecstatic to smoke a mofo at 200 meters. – Chris H.

I must have quizzed good old Chris on his experience with the DMR a thousand times by now. The training he received with a M16A4 + RCO stateside and his experience of carrying a M14 EBR overseas lead me to understand the apparent futility of dialing dope or accurate ranging in combat. Chris had a very capable rifle, excellent training, and he was unable to use the extended capabilities the .308 offered due to the nature of his combat experience. A shifty enemy… moving, hiding, and presenting themselves for a short period of time at unknown distances removed the utility of his Leupold Mil-Dot scope and his traditional marksmanship training.

Marines

The Marines Still Choose to Rock a Mil-Dot on their German Made DMR. Of course they do.

So while the mil-dot gives you more tools and more potential for precision fire, it also requires you to take more time to set up your position, range, and fire upon said target. It requires more training to maintain proficiency. It’s a Swiss army knife, but many of the tools stay folded during the chaos of combat. Ergo, I believe that fast, though imperfect, ranging from a BDC style optic is more than adequate for a rifleman. It removes SOME range error from your shooting, and that may be enough to ensure speed on target and increase your chance of a hit. Couple a good BDC optic with a 20 inch gun and you will reduce the penalty from range estimation error even further. Remember, velocity soaks up ranging error by having a flatter trajectory. If you had a laser gun all ranging error would be eliminated.

So with range/training time and real world practicality as our litmus test, I would say most shooters would be better suited for a fixed BDC optic and training with a common, easy to procure projectile. Your limitations in load selection are a bummer, but proficiency with one basic platform supersedes inefficiency with the tools you have not mastered. You can reload for a BDC, you just have to do a lot more experimenting.

Optics with multiple BDC tools etched into the reticle are ideal. They offer more than one way to quickly make range calls, some assist with holds for wind, and they still offer speed and utility.

Right now I have my eye on a 4x ACSS ACOG. It has several tools to range, is set up for common ammunition (62 grain M855 from a 20 inch gun) and has wind holds.

I find many ACOG reticles to be too small and hard to find in adverse lighting conditions, but that’s just another compromise against the other excellent features: a BDC with wind holds brings value back to the table.

Mil-dots have their place, and hunters may find them to be the proper tool for stalking and taking game at extended distances. A grazing animal removes the “return fire” variable and permits a bit more time to set up a shot vs someone who’s trying *not* to get shot. So your perceived use defines the value of one system over the other.

Wrapping Up!

Right now I am working towards my goal of assembling my DMR/Competition rifle. I will be utilizing irons until I can afford to equip the ACSS ACOG. The reticle looks a little small and easily lost in dark to light shooting conditions, but compromises have to be made with every optic system.

The argument of which is better Mil vs BDC can be settled with the following question: how much time and money do you have to master one over the other? I would rather range and fire upon a distant target with semi-precise ranging then wait for the opportunity to precisely range and fire upon a target and never get to take the shot.

Familiarize yourself with both tools, but objectively examine your situation and choose the one that will make you a more effective rifleman.

 

Written by lothaen

15 Comments

  1. Max · August 13, 2018

    Another home run, sir! Thank you for an excellent write up. I always look forward to reading your new material. Experimenting with optics can be very costly in terms of both money and time (learning to use the full capabilities of the glass). This posting helped to simplify & narrow a potential purchase decision greatly.

    • lothaen · August 13, 2018

      Im glad to be of service! I have spent tons on optics over the years. I have also experimented a little too much, but I can partially blame the blog! Without new gear sometimes this blog might not be very interesting!

  2. Jerry · August 13, 2018

    Good write up. Would the purchase of 4X ACOG have diminishing returns for those of us with aging eyes? Was under the impression that the Tritium found in the ACOG enhanced low light shooting. Leaning towards selling the A2 upper to help fund an ACOG on the A4. Is better for this old man to run a variable 1-4 or 1-6?

    • lothaen · August 13, 2018

      Hi Jerry. I also use corrective lenses and the ACOG is dependant on your visual quality. You cannot adjust the focus of thr optic / the rear objectice. Ergo, so long as you have up to date RX it should be OK. The biggest problem with many of 4x optics is that the stadia markings ARE hard to see. Going with a 6x variable will make the drop data a bit bigger in the optic and may be a better option but with a weight penalty. You can also adjust them to keep everything sharp if your eyes need another RX trip.

    • DAN III · August 13, 2018

      Jerry,

      I have several ACOGs. I find them a very durable optic. With my imperfect eyesight I have corrective lenses and can use my ACOGs which DO NOT have ocular focus capability. What I primarily use on my often fired AR-malites are low power, variable riflescopes. Variable scopes all can be focused. ACOGs cannot.

      My suggestion for you is to consider Trijicon’s 1-4x Accupoint (TR24) or their 1-6x version (TR25), second focal plane scopes. The reticle I use in both is their combat oriented Chevron on a post. I prefer the amber color. Either optic will cost you less money than their ACOG.

      If money is available then you can have your cake and eat it too with the Nightforce NX8. This is their latest 1-8x variable in first focal plane configuration. It has a lighted reticle that at 1x acts like a brilliant, red dot. It is Aimpoint bright ! It is only 8.75″ long. Weighs 17 ounces without mount and has 3.75″ of eye relief. Consider it a red dot sight with 8x capability.

      My suggestion is to get a quality, lightweight, low power variable where you can adjust the focus. Good luck on your decision.

  3. Jeff · August 13, 2018

    Hi Lothaen,

    Great post and informative as always. Similar to Jerry’s question, you mentioned you’re back to irons, have you sold off all your variables and going back to the ACOG?

    Best regards,
    Jeff

    • lothaen · August 13, 2018

      Variables are still in my inventory, but this build, with its HBAR barrel, has me looking at lighter weight options that are still legal for Highpower competition. The 4X acss seems to be the best choice for legality and usefullness outside of High Power. The BDV being set for 62 grain bullets makes reloading cheaper too since I can buy far more 62 grainers than 75HPBT match for the same price.

      Variables biggest issue for me was weight. If I build a lighter weight rifle or carbine, i am happy to keep variables equipped.

  4. Sunshine_Shooter · August 13, 2018

    So, you’re going with the ACOG to keep high-power-legal and reduce weight. Why are you going with a heavy barrel?

    • lothaen · August 13, 2018

      Because it was a Colt HBAR for $160 and the charicteristics of the stiffer barrel means it should have very favorable shooting charicteristics. 🙂

      Its not made to be a lightweight build, but I would rather avoid adding extra weight on top of the HBAR.

  5. Everyday Marksman · August 13, 2018

    Good article! I think a lot of it comes down to intended purposes. There is immense satisfaction in landing that hit at long range with the mil reticle, and there is a good reason to have the capability. But there is also a lot to be said for speed and field of view. I did a training course last year that required searching through terrain quickly to locate targets, I appreciated the clarity and FOV of the ACOG. The BDC was quick enough to land hits, especially inside 300m.

    If you go the ACOG route, definitely look for the LED models. I think they have the most versatility.

    • lothaen · August 15, 2018

      I am considering all options but still leaning to the ACSS as a general plan for my rifle. Cranking up the light to make use of thr ACOG in adverse lighting conditions is attractive!

  6. Shawn Thompson (LooseRounds 2) · August 18, 2018

    As much as I love the mildot the fact it is what I grew up on,it is not the best choice now a days. not even for hunting. it has limited utility for hunting long range or otherwise unless some one carefully develops their hold over dope using their rifle and the mildots themselves as holdover points, as a sort of impromptu BDC. something like an ACOG with a BDC that matches your barrel length, the ammo, bullet weight and velocity are a great choice if you are going to be using the same system often. The mildot was developed mainly for ranging, and we are past that now, there is no excuse to have to rely on the mildot to range with to make a long range hit, we have laser range finders and all manner of help. yeah you can argue that many dont have the money for laser range finders etc, but if thats is the case they probably couldn’t afford a quality optics with mildot made well enough for long range shooting in the first place. There are some options that give you sort of a combination BDC with mildot like ranging capabilities. If you plan to use a rifle for combat style DMR use, were you will be using the same ammo with same velocity, an ACOG with their BDCs can and will be very fast and effective. but not idea. and most users would quickly find they arent as fexible as they will eventually want it to be, What most shooters have to over come is their desire to chase equipment and try this and try that and get bored with some kit cause its not the newest piece used by SOCOM of some other crap. They get tired of something like the ACOG fast now. never really learning how useul it is, and the truth is hits to 800 and beyond are possible with the ACOG, I used to use a TAO1B for shooting nearly to 100 yards with a rifle length AR. the TAO1B had a reticle and BDC to match 7.62mm using 168 grain match loads, this load is very close to having the same trajectory as the 77 grain MK 262 clone handloads I used allowing me to have an ACOG that worked with 77gr 556mm rounds with the BDC that worked well enough. careful choice and understanding exactly what you are going to use the combo for will help you get what you want out of it, thats about all I feel like saying on it for the night

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