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Rifles, Reloading, Optics, Equipment
Reloading
5 or 3 shot group when determining ES/SD???
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<blockquote data-quote="Bart B" data-source="post: 625969" data-attributes="member: 5302"><p>Please, folks, get in touch with a mechanical engineer who's knowledge and skills are what you trust. </p><p></p><p>They'll tell you that a given barreled action has the same fundamental frequency (maximum whip angle of the bore at the muzzle) and harmonics (exact multiples of the fundamental but insignificantly small in amplitude) for each and every round fired. That happens 'cause the barrel steel's still the same stuff and so are its dimensions for each shot. The low frequency it whips at as well as the multiple harmoncs (2x, 3, 4, etc. the fundamental frequency) are exactly the same for each round regardless of how its loaded. The only difference is the magnitude of the whip, but that' doesn't change more than an insignificant amount.</p><p></p><p>A rifle barreled action is exactly like a guitar string when plucked with a pick or finger; it vibrates at the same note (frequency) each time. Only the loudness (how much it swings back and forth making sound waves) changes directly with how hard or soft it's plucked.</p><p></p><p>All this stuff about "harmonics" is grossly misunderstood by 99.99% of all rifle shooters. Once the rifle's built, its barrel whip frequency and harmonics thereof don't change......ever!!!! Shoot a round or smack it with a ball peen hammer; it vibrates the same for each.</p></blockquote><p></p>
[QUOTE="Bart B, post: 625969, member: 5302"] Please, folks, get in touch with a mechanical engineer who's knowledge and skills are what you trust. They'll tell you that a given barreled action has the same fundamental frequency (maximum whip angle of the bore at the muzzle) and harmonics (exact multiples of the fundamental but insignificantly small in amplitude) for each and every round fired. That happens 'cause the barrel steel's still the same stuff and so are its dimensions for each shot. The low frequency it whips at as well as the multiple harmoncs (2x, 3, 4, etc. the fundamental frequency) are exactly the same for each round regardless of how its loaded. The only difference is the magnitude of the whip, but that' doesn't change more than an insignificant amount. A rifle barreled action is exactly like a guitar string when plucked with a pick or finger; it vibrates at the same note (frequency) each time. Only the loudness (how much it swings back and forth making sound waves) changes directly with how hard or soft it's plucked. All this stuff about "harmonics" is grossly misunderstood by 99.99% of all rifle shooters. Once the rifle's built, its barrel whip frequency and harmonics thereof don't change......ever!!!! Shoot a round or smack it with a ball peen hammer; it vibrates the same for each. [/QUOTE]
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Reloading
5 or 3 shot group when determining ES/SD???
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