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Rifles, Reloading, Optics, Equipment
Reloading
Case weight vs internal volume
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<blockquote data-quote="benchracer" data-source="post: 961615" data-attributes="member: 22069"><p>Observing the shot to shot differences in some mixed case plinking ammo I had loaded, while playing with my Magnetospeed chrono, is what started me thinking about this. Just separating the plinking ammo by headstamp had a HUGE effect on ES and SD. </p><p> </p><p>Taking actual volume measurements to refine my QL calculations got me to thinking about the subject even more.</p><p> </p><p>Then, I started running some numbers through the JBM ballistic calculator to see how much vertical spread resulted from small velocity changes at 600, 1000, and 1500 yards. Not much at 600. Quite a bit at 1000. A LOT at 1500.</p><p> </p><p>Now I am starting to understand why long range shooters do things like sort bullets and brass. It looks like consistent case volume is pretty important in keeping ES and SD numbers low. I just wonder if weighing cases yields accurate enough control of case volume to provide the level of consistency needed at 1000 yards and further. </p><p> </p><p>I plan to experiment with sorting cases by weight vs actually measuring individual case volume to see how that translates into real world results. At some point, I expect to run into limitations involving primer and powder ignition consistency. I just don't know how far I will be able to narrow ES and SD before I get to that point.</p><p> </p><p>I know I am re-inventing the wheel here. I am mostly trying to develop my own understanding of some of the variables at play, along with how and why they apply.</p><p> </p><p>Thanks, fellas, for the discussion. I truly appreciate the opportunity to benefit from your experience.</p></blockquote><p></p>
[QUOTE="benchracer, post: 961615, member: 22069"] Observing the shot to shot differences in some mixed case plinking ammo I had loaded, while playing with my Magnetospeed chrono, is what started me thinking about this. Just separating the plinking ammo by headstamp had a HUGE effect on ES and SD. Taking actual volume measurements to refine my QL calculations got me to thinking about the subject even more. Then, I started running some numbers through the JBM ballistic calculator to see how much vertical spread resulted from small velocity changes at 600, 1000, and 1500 yards. Not much at 600. Quite a bit at 1000. A LOT at 1500. Now I am starting to understand why long range shooters do things like sort bullets and brass. It looks like consistent case volume is pretty important in keeping ES and SD numbers low. I just wonder if weighing cases yields accurate enough control of case volume to provide the level of consistency needed at 1000 yards and further. I plan to experiment with sorting cases by weight vs actually measuring individual case volume to see how that translates into real world results. At some point, I expect to run into limitations involving primer and powder ignition consistency. I just don't know how far I will be able to narrow ES and SD before I get to that point. I know I am re-inventing the wheel here. I am mostly trying to develop my own understanding of some of the variables at play, along with how and why they apply. Thanks, fellas, for the discussion. I truly appreciate the opportunity to benefit from your experience. [/QUOTE]
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Rifles, Reloading, Optics, Equipment
Reloading
Case weight vs internal volume
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