Mule deer, overstablization is not the myth you think it is. This subject was one of much discussion a couple years ago over on another site. Doc Howell explained the workings of gyroscopically influnced projectiles quite well. In a nut shell a bullet must be stable enough throught rotation induced, Gyroscopic, balancing to maintan a nose forewards flight. IE; follow the earth pointing foreward not with a nose up attitude. A bullet does not travel in a straight line it falls to Earth so in order to hit a target at any range greater than point blank the bullet must travel in an arc. Here in lies the problem with twist. Twist inparts spin which is a gyroscopic force. Should a bullet spin too fast it will maintain a nose up attitude and as velocity drops off this attitude will make the bullet unstable as the air pressure on the bullets surface will not be distributed equally. In dense moist air this is even more prevelant.
<br>So a balance must be struck between bullet weight and rotation as well as bullet diameter. Play with a kids gyroscope and a bicycle wheel some time and compare rotating forces. Larger diameter bullets require less spin to maintain stability. Any way too much spin will not allow a bullet to track nose first as it cannot over come the gyroscopic force. And we must remember all this happens in less than a second. The bullets head for ground just as fast as if you simply drop it from your hand, that is 32 feet per second . Thats plenty fast. So how much evevation is required to hit a target at 100 yards, depends on the point blank of your particular combination of bullet and speed.
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<br>Bullwnkl.
