Proving Accuracy w/ Chronograph Tests

Modern Spartan Systems Proving Accuracy w Chronogragh Tests

A little while ago, Modern Spartan Systems shot me an email about their products. Before speaking on the phone, I did my due diligence and dug into them. I’ll admit, some of the claims they were making threw up some red flags for me, mainly the claim that it tightens shot groups. I didn’t see any really convincing test data to properly back up the claim. I kept digging around and watched their videos. The closest thing to a scientific test I saw was their video of the Timken Bearing Test. The test was pretty impressive, but I was still a bit wary of the accuracy claims. So, when I finally spoke to them on the phone, I agreed to properly test the claim in an upcoming Basic Tactical Rifle course. The Basic Tactical Rifle course I teach was a great fit for the testing, because we spend time on the chronograph and grouping-­? so measuring results would be easy.

I’m not a bench rest shooter, and I did not feel in our application, that measuring shot group size would be an honest metric. The shot group size would naturally decrease throughout the course as we worked on skills. Grouping size contained too many non-­?deterministic variables to reliably test. For this reason, I focused on provable data. While more consistent velocity alone doesn’t necessarily mean better accuracy, consistent velocity is a key deterministic variable of external ballistics and does directly translate to bullet (gravity) drop when combined with other deterministic variables. Just wanted to throw that in there before the peanut gallery chimes in.

I asked all the students to clean their bores before they showed up so we could get clean results. I used an Oehler 35p chronograph. The Oehler 35p is an industry standard chronograph, which has 2 stop screen channels and compared velocities between the two to ensure there is not an error.

Day 1

We shot a string through the Oehler, without the oil, to establish velocity numbers and select a good zero distance on each rifle. We continued our training for the rest of the day without issues (we did find one rifle’s T-­?1 sight had the worst parallax movement I have ever seen past 50yds in a red dot sight, but that is another story) Students were told to clean their bores again that night and show up clean the next day.

Day 2

Early that morning I was notified we were -­?1 student as one got a sectional cleaning rod and multiple patches stuck. (Stop using Otis origami patches, use one square in your caliber and pull, don’t push from chamber to barrel. If it takes more effort than you can exert without spilling your beer (don’t judge-­? you know you do this), stop and lightly tap it out the way it came with a mallet).

On arrival, we followed the initial treatment protocol.

  1. We ran a patch wet with Accuracy Oil through each bore a few times.
  2. We then fired a 10 round group @ 100yds.
  3. After checking targets, we re-­?treated all barrels, running a patch wet with Accuracy oil through each bore a few times.
  4. We then fired a 10 round group @ 100yds.
  5. After checking targets, we re-­treated all barrels, running a patch wet with Accuracy oil through each bore a few times.
  6. We then fired a 10 round group @ 100yds.
  7. After checking targets, we re-­treated all barrels, running a patch wet with Accuracy oil through each bore a few times.
  8. We then fired a 10 round group @ 100yds.
  9. After checking targets, we re-­treated all barrels, running a patch wet with Accuracy oil through each bore a few times.
  10. We then fired a 10 round group @ 100yds.
  11. All rifles were then chronographed

To summarize-­ we cleaned, then treated, then fired 5 x 10rd groups, treating between each group, then recorded data.

Everyone in the class was pretty amazed by the results. Every shooter gained velocity, decreased their standard deviation, and drastically decreased their extreme velocity spread.  

Just in case you may not be familiar with chronograph data or it’s meaning, let me define the terms as the Oehler 35p captures them:

  • Highest Velocity -­ simply, the fastest value collected.
  • Lowest Velocity -­ simply, the lowest value collected.
  • Extreme Velocity Spread -­ this is the simple difference between the highest and lowest value collected.
  • Mean Velocity -­ This is the average of the data collected.

Standard Deviation-­ this value describes the uniformity. The value is represented like this: +/-­? 18fps. This value means that, based on the data collected, at least 2/3rd of the rounds you fire will be within 18fps of the average velocity (the actual math behind calculating this will make your head hurt, just trust me here).

The Hard Numbers

RIFLES (ALL AR-15 SERIES)SPECSAMMO
Gun 1Colt 16″, 1/7XM193
Gun 2Barnes Tactical 16″ 1/7XM855
Gun 3LWRC -­ SPR 16″ 1/755 gr PMC FMJ-­BT
Gun 4Noveske SBR 12.5″ 1/7XM193
Gun 5JP 16″ 1/855 gr Hornady
Now, Let’s have a look at the equipment used. Below is a chart of the rifles and the ammo they used, each ammo type was from the same lot, respectively

I liked that we had a good spread of brands and ammo, so we could rule out values only being consistent to one type or brand.

WEATHER DATADAY 1DAY2
TERPERATURE61.3 F71.4F
HUMIDITY79%85%
PRESSURE30.19in29.96in
Here is the weather condition from the two days at the time of measurement for each day. No huge differences that would drastically alter the results

Now, let’s get down to it.

GUN 1
16.1″, XM193
CLEAN BORETREATED BORECHANGE% CHANGE
HIGHEST
VELOCITY
30733102290.94%
LOWEST
VELOCITY
29973041441.47%
EXTREME
VELOCITY
SPREAD
7661-15-19.74%
MEAN
VELOCITY
30493080311.02%
STANDARD
DEVIATION
242020-16.67%
Here is Gun #1’s results and I’ll break down the numbers

The “Clean Bore” column represents the data from Day 1, which was untreated with the Accuracy Oil, the “Treated Bore” is from Day 2 after the treatment steps were finished.

  • We can see right away that the Highest Velocity and the Lowest Velocity both increased.
  • We also see that the Extreme spread decreased, which is great.
  • The Mean Velocity increased.
  • The Standard Deviation decreased.

All of these numbers are improvements, indicating the Accuracy Oil works. -4 on a standard deviation may not sound like much but it is.

Now that we’ve broken down the results, lets look at the other 4 rifles:

GUN 2
16.1″, XM855
CLEAN BORETREATED BORECHANGE% CHANGE
HIGHEST
VELOCITY
28992939401.38%
LOWEST
VELOCITY
28002871712.54%
EXTREME
VELOCITY
SPREAD
9968-31-31.31%
MEAN
VELOCITY
28502904541.89%
STANDARD
DEVIATION
2823-5-17.86%
Gun 2 – 16.1″, XM855
GUN 3
16″ PMC 55 gr FMJ-BT
CLEAN BORETREATED BORECHANGE% CHANGE
HIGHEST
VELOCITY
29552947-8-0.27%
LOWEST
VELOCITY
28022890883.14%
EXTREME
VELOCITY
SPREAD
15357-96-62.75%
MEAN
VELOCITY
28652911461.61%
STANDARD
DEVIATION
4517-28-62.22%
Gun 3 – 16″, PMC 55 gr FMJ-BT
GUN 4
12.9″, XM193
CLEAN BORETREATED BORECHANGE% CHANGE
HIGHEST
VELOCITY
28762911351.22%
LOWEST
VELOCITY
27622833712.57%
EXTREME
VELOCITY
SPREAD
11478-36-31.58%
MEAN
VELOCITY
28162871551.95%
STANDARD
DEVIATION
3126-5-16.13%
Gun 4 – 12.9″, XM193
GUN 5
16″, 55 gr Hornady
CLEAN BORETREATED BORECHANGE% CHANGE
HIGHEST
VELOCITY
31153100-15-0.48%
LOWEST
VELOCITY
30203054341.13%
EXTREME
VELOCITY
SPREAD
9546-49-51.58%
MEAN
VELOCITY
30693079100.33%
STANDARD
DEVIATION
25-1312-48.00%
Gun 5 – 16″, 55 gr Hornady

Yep, you’re seeing that right and we were just as impressed when we saw the results print out. Every single rifle register improvements across the board-regardless of rifle manufacturer and ammo type.

Some rifles recorded results that were FAR more drastic than others, but that could also be explained by barrel condition. The manufacturer claims the oil bonds with the inside of the area, creating a smoother surface – decreasing friction. So, if that is correct, then a barrel with more imperfections could show more improvements than a barrel in better condition. The results on Gun #3 are an example of this.

Now, let’s see an average of all the guns:

AVERAGE CHANGEFPS CHANGE% CHANGE
HIGHEST
VELOCITY
16.200.56%
LOWEST
VELOCITY
61.602.17%
EXTREME
VELOCITY
SPREAD
-45.40-39.39%
MEAN
VELOCITY
39.201.36%
STANDARD
DEVIATION
-10.80-38.18%
Average Change

Here is a chart, referencing Gun #2 and translating the velocities to inches of drop at 300 yards.

GUN 2
16.1″, XM855
UNTREATED
DROP @ 300 YDS
TREATED
DROP @ 300 YDS
CHANGE% CHANGE
HIGHEST
VELOCITY
-27.00-26.300.70-2.59%
LOWEST
VELOCITY
-28.80-27.501.30-4.51%
EXTREME
VELOCITY
SPREAD
1.801.20-0.60-33.33%
MEAN
VELOCITY
-27.90-26.901.00-3.58%
GUN 2 – 16.1″, XM855 – DROP @ 300 YDS

What this is showing is that this shooter’s lowest point of impact raised y 1.3″ and his average point of impact by 1″. This means that his rifle is now shooting flatter out to 300yds. If you customize your zero distance, that 1.3″ gain can help a lot in balancing how high your round is above your line of sight between 100 – 200yds and how low it is at 300yds.

The Extreme Velocity Spread section shows the difference, in inches, of the high and low velocity rounds. This translates to a difference in shot group size (yes, other external ballistic factors will affect this as well). So, untreated we had a 1.8″ size and treated we had a 1.2″ size a change of -0.6″ or 33.33%.

Gun #2 had fairly average results in our group, here’s Gun #3:

GUN 3
16.1″, XM855
UNTREATED
DROP @ 300 YDS
TREATED
DROP @ 300 YDS
CHANGE% CHANGE
HIGHEST
VELOCITY
-27.40-27.600.20-0.73%
LOWEST
VELOCITY
-30.30-28.601.70-4.51%
EXTREME
VELOCITY
SPREAD
2.91-1.90-33.33%
MEAN
VELOCITY
-29.10-28.200.90-3.09%
GUN 3 – 16.1″, XM855 – DROP @ 300 YDS

So, Gun #3 had its lowest drop pushed up 1.7″ and its average drop pushed up .9″. The big story with this rifle is the extreme spread. Before treatment, the velocities indicted a drop spread of 2.9″, after treatment it shrunk to 1″. I’d take a decrease in shot group size due to drop spread of 1.9″ any day.

Conclusion

The product works with regards to its muzzle velocity claims, get this stuff in your barrel now. I still want to see better and more extensive testing. If this oil is decreasing friction to this extent, we should see a very noticeable increase in barrel life. I want to see number on that. I’d like to see how many rounds this treatment lasts, and see a treatment schedule recommended. I’d like to see some testing on how it performs in the upper receiver beyond “it feels great”. Until that happens, I can’t recommend that guys who pull triggers doing jobs where their lives depend on it put this on their bolt. But, I will absolutely recommend getting this oil in your barrel today.

On a side not, before this course I used their Carbon Destroyer on my bolt. I had a decent amount of carbon plating on it. I let the product soak in it while I cleaned my bore. Almost all the carbon came off with an all-purpose brush. Sorry I didn’t get any pictures of the before and after, gut give it a try yourself.

Green Eye Tactical

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