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Rifles, Reloading, Optics, Equipment
Reloading
What is acceptable velocity variation
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<blockquote data-quote="Bart B" data-source="post: 778055" data-attributes="member: 5302"><p>One thing will cause all bullets leaving at the same velocity to have some vertical stringing. All bullets don't have the same BC when fired. The slight unbalance they all have causes them to wobble a bit in flight. The more they're unbalanced and wobble, the more drag they have and the more they'll drop 'cause they have lower ballistic coefficents.</p><p></p><p>One thing will cause bullets leaving at several velocities to have near zero verticle stringing. Bullets leaving the muzzle on its way up and close to maximum angle of barrel whip will be compensated for their velocity. Slower ones leave later in the upswing and depart at a slightly greater angle. Faster ones leave sooner at slightly lower angles.</p><p></p><p>Therefore, the amount of vertical shot stringing way down range may not directly reflect muzzle velocity spread. I've shot a few dozen rounds through chronographs at 1000 yard targets and noticed faster ones do not always strike higher nor slower ones always strike lower. Sometimes the results are reversed. And the velocity spread versus drop as calculated by ballistic software doesn't match actual firing results.</p><p></p><p>And vertical shot stringing at any range also includes the variables of the rifle and shooter.</p></blockquote><p></p>
[QUOTE="Bart B, post: 778055, member: 5302"] One thing will cause all bullets leaving at the same velocity to have some vertical stringing. All bullets don't have the same BC when fired. The slight unbalance they all have causes them to wobble a bit in flight. The more they're unbalanced and wobble, the more drag they have and the more they'll drop 'cause they have lower ballistic coefficents. One thing will cause bullets leaving at several velocities to have near zero verticle stringing. Bullets leaving the muzzle on its way up and close to maximum angle of barrel whip will be compensated for their velocity. Slower ones leave later in the upswing and depart at a slightly greater angle. Faster ones leave sooner at slightly lower angles. Therefore, the amount of vertical shot stringing way down range may not directly reflect muzzle velocity spread. I've shot a few dozen rounds through chronographs at 1000 yard targets and noticed faster ones do not always strike higher nor slower ones always strike lower. Sometimes the results are reversed. And the velocity spread versus drop as calculated by ballistic software doesn't match actual firing results. And vertical shot stringing at any range also includes the variables of the rifle and shooter. [/QUOTE]
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Rifles, Reloading, Optics, Equipment
Reloading
What is acceptable velocity variation
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