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Bite The Bullet

Does Madbull moscarts fire harder? (2009-08-11)

In this Bite The Bullet article, we will attempt to put a figure or at least a more accurate guideline fps range for a moscart shot's fps by comparing the values with muzzle velocity from known guns.

Test idea:
All muzzle velocity measurements will be given in feet per second (fps) via the Guarder chrono using KSC .20g ammo.
Using the home-made ballistic gel made in a consistency to measure regular airsoft gun shots, the guns with known fps values will be shot into the gel yielding a penetration measurement that is found by using a vernier caliper which, in turn can then be compared with the penetration of the moscart shots.
It is understood that the initial BBs towards the front of the moscart will be propelled in a slower speed than the ones towards the rear of the moscart since the gas accelerating the round will disperse around the environment as soon as it leaves the barrel of the moscart, deceleration will occur due to aerodynamic forces such as friction.

     

 

Control:
With that in mind, a few guns with different power ranges must be used to provide a range of penetration distances to act as a control. All the shots will be fired into the same gel block to ensure the viscosity is constant throughout the test. The following guns have been chosen for the purpose of this test:
- A low powered springer pistol (176fps)
- NBB Ruger loaded with 134a (283fps)
- a stock TM M4 AEG (257fps)

As seen in the pictures above, the NBB ruger proves to show it has the higher penetration power with the TM M4 AEG showing slightly less penetration than the Ruger as there is only 26fps difference.

With the control shots made on the gel block, we now have an idea of how far the penetration will be at a known fps, we can now compare this with the penetration with the moscart shots.

Test:
Knowing a charge of gas can have just under 200 rounds sharing the energy provided, a lower limit control shot must be produced. This is where the low powered springer pistol is useful, with the NBB Ruger yielding 280fps and the springer pistol at 180fps, we now have the upper and lower control figures to work with.

Having proceeded with the upper and lower limit control shots, the measurement shots can then be taken with the other guns. This is to help determine the power of the moscart shots by narrowing down the error margin when comparing the penetration distance.

Every gun was chrono'd to give an idea of the correlation between the penetration distance and the fps figure. The moscart is then fired on a fresh part of the gel block to ensure it will not interfere with an existing penetration path within the gel block. After all the control shots and moscarts were fired into the gel block, the block was cut avoiding every penetration path made by the BBs so that the penetrated distance was not interfered. When measuring the penetration distance, an incision was made in front of the BB to allow the round to fall out, where it will leave a cavity clearly seen shortly after the round exits the gel allowing the measurement to be made with more precision.

With the 190rds moscart, it is clear that the penetration is not very spectacular. As mentioned previously, 190 rounds shared per charge of gas will considerably lower the average fps of the rounds. In a nutshell, the rounds will have a lower penetration power due to this.

Using the 90rds moscart, it is clearly shown on the first picture that the initial impulse is high, it was able to move the testing platform even with a brick placed behind the gel block (hidden under the blank sheet of paper to reduce contamination) to hold the gel block steady for testing.

     

Finally, using the 120rds Madbull moscart, it is obvious that it can offer a higher output power even when using 30rounds more than an alternative moscart. With its high output power, it was able to cut a circle around the gel almost penetrating the same distance as the 180fps springer did on a single shot.

Results and summary:

Gun/Moscart FPS reading Penetration (mm)
Springer pistol
176
38.86

TM M4 AEG

257

58.32

NBB Ruger

283

65.56

190 rounds moscart

N/A

17.68

90 rounds moscart

N/A

22.40

Madbull 120 rounds

N/A

29.56

With the Madbull 120rounds penetrating over 6mm ahead of the 90rounds moscart, it is clear that the madbull design really does have a higher output power both by looking at the damage caused on the gel block as well as by the penetration distance. Assuming the 6mm variance is proportional to the higher fps when comparing the difference between the TM M4 and the NBB Ruger, the difference in fps between the 120 rounds with 90 rounds moscart is by around 26fps and comparing the 120 rounds moscart with the springer pistol, with the same linear comparison, it would give a reading of around 135fps.

Even though using the ballistic gel allowed us to see the Madbull moscart is indeed more powerful and also gave us a closer idea of the penetration power with a ballpark figure on its fps values. This is not completely accurate as a fps reading since the BBs towards the front of the moscart will be at a slower fps creating the inital contact with the gel, which does not allow the stronger follow-up shots on the discharge to have a direct hit on to the gel causing the power to be reduced as it had either deflected the follow-up shots or created more resistance during the penetration.