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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
375/408 Banded Solids Test
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<blockquote data-quote="noel carlson" data-source="post: 361408" data-attributes="member: 16138"><p>Kelly,</p><p> </p><p>The original 431 grain ZA375/7.0 went through significant tail revision in order to achieve dynamic stability beyond 2,600 fps in a 1: 8" twist, although it was highly accurate when fired at that velocity. It just goes to illustrate the limitations of an SG calc.</p><p> </p><p>The 2nd (420 grain, solid copper) version gained another 150 fps in stable flight from a 1: 8". The 6.5" twist added even more potential, but the case capacity permits velocities of up to 2,950 fps, and the ZA/7.0 copper solid is still not fully stable at that velocity. I expect the PDT core to confer a significant gain in dynamic stability, without a net change in projectile mass. The ultimate twist requirement is unestablished, for the ZA375/7.0-W, at this point.</p><p> </p><p>Terry gave you good advice. Hold on for a few weeks.</p></blockquote><p></p>
[QUOTE="noel carlson, post: 361408, member: 16138"] Kelly, The original 431 grain ZA375/7.0 went through significant tail revision in order to achieve dynamic stability beyond 2,600 fps in a 1: 8" twist, although it was highly accurate when fired at that velocity. It just goes to illustrate the limitations of an SG calc. The 2nd (420 grain, solid copper) version gained another 150 fps in stable flight from a 1: 8". The 6.5" twist added even more potential, but the case capacity permits velocities of up to 2,950 fps, and the ZA/7.0 copper solid is still not fully stable at that velocity. I expect the PDT core to confer a significant gain in dynamic stability, without a net change in projectile mass. The ultimate twist requirement is unestablished, for the ZA375/7.0-W, at this point. Terry gave you good advice. Hold on for a few weeks. [/QUOTE]
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375/408 Banded Solids Test
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