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Old 02-11-2010, 11:02 PM   #1 (permalink)
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subsonic ammunition - observations and questions

I'm going to venture where I really have little business other than being curious and some background in the sciences. Some of this will be obvious to some of you, so humor me.




Kinetic energy = 1/2 * mass * velocity^2

in order to remain subsonic, a bullet must stay below the speed of sound (duh) which for the sake of this discussion, we'll call 1100fps

Plugging 1100fps into the above equation for velocity, we're really only left with the mass of the bullet to play with to change the kinetic energy delivered to the target.

Assuming centerfire rifle ammo.

1. What would make a certain caliber more desirable over another for for subsonic ammunition?

2. Using 300 win mag as an example, you're going to be cutting your muzzle velocity from 2700fps down to the 1100fps. How does one make up for that loss? Upping bullet mass would do a bit, but velocity is squared, making mass a much smaller part of the equation.

3. How effective would a suppressor be on a sonic round? Obviously there would be the sonic crack, but how directional is that sound?

This was all prompted by me watching the vid in this thread. So I guess this last question would be more from a "sniper scenario".
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Old 02-11-2010, 11:20 PM   #2 (permalink)
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YouTube - 308 supersonic and subsonic suppressed

here is a sound comparison for ya. as far as down range... i am curious as well.
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Old 02-12-2010, 12:12 AM   #3 (permalink)
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This is pretty quiet too.
YouTube - Silenced AK-47 with subsonic ammo
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Old 02-12-2010, 06:04 AM   #4 (permalink)
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Quote:
Originally Posted by Mo View Post
I'm going to venture where I really have little business other than being curious and some background in the sciences. Some of this will be obvious to some of you, so humor me.




Kinetic energy = 1/2 * mass * velocity^2

in order to remain subsonic, a bullet must stay below the speed of sound (duh) which for the sake of this discussion, we'll call 1100fps

Plugging 1100fps into the above equation for velocity, we're really only left with the mass of the bullet to play with to change the kinetic energy delivered to the target.

Assuming centerfire rifle ammo.

1. What would make a certain caliber more desirable over another for for subsonic ammunition?
The ability to stabalize subsonicly
2. Using 300 win mag as an example, you're going to be cutting your muzzle velocity from 2700fps down to the 1100fps. How does one make up for that loss? Upping bullet mass would do a bit, but velocity is squared, making mass a much smaller part of the equation.
You either do not and suck up the loss or use a heavier round and worry about it being stable.
Actualy you need to worry about it being stable no matter what

3. How effective would a suppressor be on a sonic round? Obviously there would be the sonic crack, but how directional is that sound?
I can fire my AK with my can on and not need hearing protection. It alters the sound to something most people do not think of as a "bang". Downrange your hearing is drawn more to the crack of the bullet and not so much the shooter
This was all prompted by me watching the vid in this thread. So I guess this last question would be more from a "sniper scenario".
...
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