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Rifles, Reloading, Optics, Equipment
Reloading
Loading to magazine length/bent tips
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<blockquote data-quote="CONatureBoy" data-source="post: 2215599" data-attributes="member: 118769"><p>Nothing, if it shoots straight. I get better accuracy from VLDs when I load them close to the lands. My understanding is the bullet has less distance/time to get off center from launch to engagement with the lands, so it enters the barrel closer to being perfectly centered, and positioned more consistently. (I wonder whether powder loads that are close to 100% reduce this effect by doing a better job producing a spatially symmetric pressure gradient behind the bullet, at launch?)</p><p></p><p>I am under the impression that loading close to the lands has another effect, namely to increase resistance to the pressure building behind the bullet earlier, because the gases produced by the burning powder can't escape around the bullet for as long. This would tend to produce a sharper pressure peak, requiring more care with near-maximum loads to avoid overpressure conditions. (I have read that this effect at least partially motivated the design of most Weatherby chambers, which--the 240 Weatherby aside--have long throats to give the gases more time to escape around the bullet, while ultimately allowing more powder to burn behind the bullet. Weatherby cartridges are overbore, and this was a way to handle all that powder before our era of abundantly available slow-burning powders.) I'm no expert, but this hypothesis is consistent with my experiences handloading for a dozen or so rifles. I get a bit more speed out of a bit less powder when I load close to the lands. I haven't tried to quantify that effect.</p></blockquote><p></p>
[QUOTE="CONatureBoy, post: 2215599, member: 118769"] Nothing, if it shoots straight. I get better accuracy from VLDs when I load them close to the lands. My understanding is the bullet has less distance/time to get off center from launch to engagement with the lands, so it enters the barrel closer to being perfectly centered, and positioned more consistently. (I wonder whether powder loads that are close to 100% reduce this effect by doing a better job producing a spatially symmetric pressure gradient behind the bullet, at launch?) I am under the impression that loading close to the lands has another effect, namely to increase resistance to the pressure building behind the bullet earlier, because the gases produced by the burning powder can't escape around the bullet for as long. This would tend to produce a sharper pressure peak, requiring more care with near-maximum loads to avoid overpressure conditions. (I have read that this effect at least partially motivated the design of most Weatherby chambers, which--the 240 Weatherby aside--have long throats to give the gases more time to escape around the bullet, while ultimately allowing more powder to burn behind the bullet. Weatherby cartridges are overbore, and this was a way to handle all that powder before our era of abundantly available slow-burning powders.) I'm no expert, but this hypothesis is consistent with my experiences handloading for a dozen or so rifles. I get a bit more speed out of a bit less powder when I load close to the lands. I haven't tried to quantify that effect. [/QUOTE]
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Rifles, Reloading, Optics, Equipment
Reloading
Loading to magazine length/bent tips
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