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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
External Ballistics Experiment
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<blockquote data-quote="nmbarta" data-source="post: 1976310" data-attributes="member: 78438"><p>There is another way to look at this, </p><p>You can get a rough idea of the maximum possible gains by looking at your ballistics calculator.</p><p>Take 55 gr berger @ 3000fps, and set your start range at zero and your step size at one.</p><p>What you'll find is, that bullet slowing down between 2 and 3 fps per yard. This reduction is speed is mostly due to atmospheric resistance. So based on that, 3fps in a 36" barrel would (in theory) be the maximum possible gain, but that would require the bullet to be at 3000fps all the way through the barrel, which it is not. You also have to consider, what percentage air resistance has on the overall acceleration of the bullet (likely a small percentage in comparison to friction and bullet engraving) Though, there probably is some change, I would bet that the actual measurable difference between firing a rifle at sea level, and firing a rifle in a vacuum would be a small fraction of 1 fps. This is obviously not a big enough difference for us to measure.</p><p>Fun stuff to think about, but I'm quite sure you won't find any measurable difference.</p></blockquote><p></p>
[QUOTE="nmbarta, post: 1976310, member: 78438"] There is another way to look at this, You can get a rough idea of the maximum possible gains by looking at your ballistics calculator. Take 55 gr berger @ 3000fps, and set your start range at zero and your step size at one. What you'll find is, that bullet slowing down between 2 and 3 fps per yard. This reduction is speed is mostly due to atmospheric resistance. So based on that, 3fps in a 36" barrel would (in theory) be the maximum possible gain, but that would require the bullet to be at 3000fps all the way through the barrel, which it is not. You also have to consider, what percentage air resistance has on the overall acceleration of the bullet (likely a small percentage in comparison to friction and bullet engraving) Though, there probably is some change, I would bet that the actual measurable difference between firing a rifle at sea level, and firing a rifle in a vacuum would be a small fraction of 1 fps. This is obviously not a big enough difference for us to measure. Fun stuff to think about, but I'm quite sure you won't find any measurable difference. [/QUOTE]
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Rifles, Reloading, Optics, Equipment
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External Ballistics Experiment
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