Once the bullet crosses the sound barrier, it either tumbles or moves onto a new trajectory caused by disturbance. muzzle velocity and greater energy than traditional brass cases. We can see how the velocity of the projectile is about to breach the sound barrier speed. 308 Winchester 168gr SMK bullet (muzzle velocity of 2500fps) is 800 meters, at standard sea-level pressure. From this point onward, the projectile’s trajectory most often becomes indeterminable and accuracy is lost.Ībove: the effective range of this. The velocity at which your projectile will breach the sound barrier sits at around 343mps or 1,125fps (in dry air, at 20☌). Tip: ballistic coefficient (BC), which is a figure representing your bullet’s ability to overcome air resistance in flight, can be found on the ammunition box or the manufacturer’s website. Your rifle’s current effective range can be determined by entering the muzzle velocity, your projectile’s ballistic coefficient, and your average atmospheric pressure into a ballistics calculator, and then determining at which point your projectile transitions from supersonic to subsonic speed – known as the bullet’s transonic range.
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