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Hornady at it again
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<blockquote data-quote="Doom2" data-source="post: 3010329" data-attributes="member: 108323"><p>There are some simple reasons that tuners work, or don't, or might. Barrels vibrate and a precision load will be a precision load (on leaving the barrel only if the barrel is pointed in the same direction on each shot and any velocity transverse to the bullet velocity induced by barrel vibration is consistent. Barrel Stiffness (length) and weight will determine the frequency of vibration and magnitude. In a heavy barreled rifle a load that is leaving the barrel when the translational velocity of the barrel is slow, small changes in barrel weight distribution (tuning) will not have a significant effect on the precision for minor changes in velocity of the bullet. If however the load and bullet leave during high translational velocity of the barrel then a small change in weight distribution may correct for minor change in bullet velocity. </p><p></p><p>As for testing. To see the effect of a tuner requires that the tuner effect be significant enough to effect the precision to a greater extent than the other effects that are driving the precision of the rifle. This includes all of the internal ballistic's effects and also the ones noted related to the barrel. So test load SD, ES, barrel fouling, case volume, etc will affect the testing results. Otherwise the effect will be lost in the noise.</p><p></p><p>Given a 1/2 MOA rifle or shooter it's not likely that an effect would be seen. If however, you have a rifle, load, and shooter capable of shooting in the teens then it may be possible to see a tuner effect and possibly see an improvement in the actual precision of a load. But it's also possible that it won't, going back to the initial concept of what the barrel velocity is doing at the moment the bullet leaves the barrel.</p></blockquote><p></p>
[QUOTE="Doom2, post: 3010329, member: 108323"] There are some simple reasons that tuners work, or don't, or might. Barrels vibrate and a precision load will be a precision load (on leaving the barrel only if the barrel is pointed in the same direction on each shot and any velocity transverse to the bullet velocity induced by barrel vibration is consistent. Barrel Stiffness (length) and weight will determine the frequency of vibration and magnitude. In a heavy barreled rifle a load that is leaving the barrel when the translational velocity of the barrel is slow, small changes in barrel weight distribution (tuning) will not have a significant effect on the precision for minor changes in velocity of the bullet. If however the load and bullet leave during high translational velocity of the barrel then a small change in weight distribution may correct for minor change in bullet velocity. As for testing. To see the effect of a tuner requires that the tuner effect be significant enough to effect the precision to a greater extent than the other effects that are driving the precision of the rifle. This includes all of the internal ballistic's effects and also the ones noted related to the barrel. So test load SD, ES, barrel fouling, case volume, etc will affect the testing results. Otherwise the effect will be lost in the noise. Given a 1/2 MOA rifle or shooter it's not likely that an effect would be seen. If however, you have a rifle, load, and shooter capable of shooting in the teens then it may be possible to see a tuner effect and possibly see an improvement in the actual precision of a load. But it's also possible that it won't, going back to the initial concept of what the barrel velocity is doing at the moment the bullet leaves the barrel. [/QUOTE]
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