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Rifles, Reloading, Optics, Equipment
Reloading
How far apart are "nodes"
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<blockquote data-quote="FearNoWind" data-source="post: 988795" data-attributes="member: 50867"><p>Not intending to offer judgment here, but when I read the paper I was troubled where:</p><p> He says (bottom of the first page) that (making reference to a charge change of 0.3 grains or a seating depth change of 0.010" ) "The change in groups, on the other hand, was dramatic"</p><p> Then he says, "If the dispersion was due to these beam bending modes, then it should be fairly insensitive to small changes in charge and seating depth." and concludes that "<u>sensitivity to small changes was not from changes in the bending modes.</u>"</p><p> Then he says that he agrees that the <u>POI changes are primarily due to the bending modes</u>, but because they are so low in frequency, they are "smooth" and do not change rapidly over load variations.</p><p>Isn't that contradictory? Perhaps it works in electronic theory but how does it stand up to mechanical resonance theory?</p><p>IMO, he missed the phase relationship between the induced and the reflected waves as it relates to barrel time.</p><p> But if it works in your shop, go for it.</p></blockquote><p></p>
[QUOTE="FearNoWind, post: 988795, member: 50867"] Not intending to offer judgment here, but when I read the paper I was troubled where: He says (bottom of the first page) that (making reference to a charge change of 0.3 grains or a seating depth change of 0.010” ) "The change in groups, on the other hand, was dramatic" Then he says, "If the dispersion was due to these beam bending modes, then it should be fairly insensitive to small changes in charge and seating depth." and concludes that "[U]sensitivity to small changes was not from changes in the bending modes.[/U]" Then he says that he agrees that the [U]POI changes are primarily due to the bending modes[/U], but because they are so low in frequency, they are “smooth” and do not change rapidly over load variations. Isn't that contradictory? Perhaps it works in electronic theory but how does it stand up to mechanical resonance theory? IMO, he missed the phase relationship between the induced and the reflected waves as it relates to barrel time. But if it works in your shop, go for it. [/QUOTE]
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Rifles, Reloading, Optics, Equipment
Reloading
How far apart are "nodes"
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