Did the first round bounce off the ground first or did it just keyhole on it's own?
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Did the first round bounce off the ground first or did it just keyhole on it's own?
That was a skip...Quote:
Originally Posted by GunsRBadMMMMKay
Bullets get more stable the farther they fly, not less. The speed of rotation doesn't decay as quickly as the forward velocity, so the stability factor increases with distance from the muzzle.
This is from wiki so it may be wrong butQuote:
Originally Posted by Tim K
The transonic problem[edit]
When the velocity of a rifle bullet fired at supersonic muzzle velocity approaches the speed of sound it enters the transonicregion (about Mach 1.2–0.8). In the transonic region, the centre of pressure (CP) of most bullets shifts forward as the bullet decelerates. That CP shift affects the (dynamic) stability of the bullet. If the bullet is not well stabilized, it can not remain pointing forward through the transonic region (the bullets starts to exhibit an unwanted precession or coning motion that, if not damped out, can eventually end in uncontrollable tumbling along the length axis). However, even if the bullet has sufficient stability (static and dynamic) to be able to fly through the transonic region and stays pointing forward, it is still affected. The erratic and sudden CP shift and (temporary) decrease of dynamic stability can cause significant dispersion (and hence significant accuracy decay), even if the bullet's flight becomes well behaved again when it enters the subsonic region. This makes accurately predicting the ballistic behavior of bullets in the transonic region very difficult. Further the ambient air density has a significant effect on dynamic stability during transonic transition. Though the ambient air density is a variable environmental factor, adverse transonic transition effects can be negated better by bullets traveling through less dense air, than when traveling through denser air. Because of this, marksmen normally restrict themselves to engaging targets within the supersonic range of the bullet used.[note 1]
But no one will believe you because their daddy told them that bullets go tumbling.[ROFL1]Quote:
Originally Posted by Tim K
Physicists and/or Aerospace Engineers are ones I would listen to.
http://physics.info/turbulence/
Looks to me like that supports tumblingQuote:
Originally Posted by MrPrena
I only listen to my local elected official when it comes to gun info.
Read Litz's first book if you want a detailed explanation. To be clear, I should have said that a bullets stability as predicted by the Miller Stability formula increases with distance from the muzzle. Whether or not a bullet become unstable in the transonic region is dependent on a number of factors including bullet shape, rotational velocity, etc. Many of the long pointy bullets used by LR shooters remain stable through the transonic region.