Suppressors Thunder Beast Education Video #2 Supersonic Crack and Velocity
- Thread starter TBACRAY
- Start date
Weapons/ammo used
-8” 300 Blackout Remington 700 with Red Mountain Arsenal 110gr V-max
-MV = 2178 fps
-12.7” .308 LWRC R.E.P.R. with M118LR
-MV = 2298 fps
-20” .308 AI AX with M118LR
-MV = 2630 fps
-26” 300 Norma Mag AI AXMC with 230 gr Berger Match
-MV = 2861 fps
-Muzzle velocities were obtained using a magnetospeed on the same shot as the waveform shown.
·-Peak dB vs MV
2178 fps: 131.9
2300 fps: 134.2
2630 fps: 134.7
2860 fps: 134.6
The biggest take away from the data is yes velocity does affect the supersonic peak dB. It also seems that above 2300 fps the peak dB begins to level out. In a perfect experiment we would have used the exact same bullet for each velocity but after examining some theoretical equations for estimating supersonic peak the dominating factors are the diameter of the bullet (which was constant) and the velocity of the projectile. Here is a simplified explanation showing how the length of the projectile is a factor but the equation is dominated by the cross-sectional area and velocity. For us the cross-sectional area is a circle with a .308 diameter. https://www.pdas.com/refs/tp1122.pdf
-8” 300 Blackout Remington 700 with Red Mountain Arsenal 110gr V-max
-MV = 2178 fps
-12.7” .308 LWRC R.E.P.R. with M118LR
-MV = 2298 fps
-20” .308 AI AX with M118LR
-MV = 2630 fps
-26” 300 Norma Mag AI AXMC with 230 gr Berger Match
-MV = 2861 fps
-Muzzle velocities were obtained using a magnetospeed on the same shot as the waveform shown.
·-Peak dB vs MV
2178 fps: 131.9
2300 fps: 134.2
2630 fps: 134.7
2860 fps: 134.6
The biggest take away from the data is yes velocity does affect the supersonic peak dB. It also seems that above 2300 fps the peak dB begins to level out. In a perfect experiment we would have used the exact same bullet for each velocity but after examining some theoretical equations for estimating supersonic peak the dominating factors are the diameter of the bullet (which was constant) and the velocity of the projectile. Here is a simplified explanation showing how the length of the projectile is a factor but the equation is dominated by the cross-sectional area and velocity. For us the cross-sectional area is a circle with a .308 diameter. https://www.pdas.com/refs/tp1122.pdf
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