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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
Hornady ELD-X Official Thread
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<blockquote data-quote="IdahoCTD" data-source="post: 1130746" data-attributes="member: 13110"><p>Weight/mass is a factor along with bearing surface (friction). If the force applied (in this case the pressure they are loaded at with the same powder) is the same those two determine acceleration. ΣF = ma or all of the forces applied (including friction, gravity, pressure) equals mass times acceleration. We can measure acceleration as well to determine friction. If the 215 Berger is faster (acceleration) then the 210, loaded to equal pressure, then you can assume that less friction (shorter bearing surface) is a greater factor than the 5grs of additional weight (mass). </p><p></p><p>If you shot the original X bullets versus the TSX's, with the grooves cut in the bearing surface, this would make more sense. Since solid copper bullets are long for their weight they tend to have longer bearing surfaces which equals more drag. Grooving the exterior reduces the drag at the expense of BC. I'm not sure why they don't make the grooves look more like waves along the exterior instead of sharp edged grooves. That to me would reduce drag due to less sharp edges. It would be a rather simple process with a lathe turned bullet. The originals were pretty slow and fouled bad not to mention their on game performance wasn't very good due to the shallow and small hollow point.</p></blockquote><p></p>
[QUOTE="IdahoCTD, post: 1130746, member: 13110"] Weight/mass is a factor along with bearing surface (friction). If the force applied (in this case the pressure they are loaded at with the same powder) is the same those two determine acceleration. ΣF = ma or all of the forces applied (including friction, gravity, pressure) equals mass times acceleration. We can measure acceleration as well to determine friction. If the 215 Berger is faster (acceleration) then the 210, loaded to equal pressure, then you can assume that less friction (shorter bearing surface) is a greater factor than the 5grs of additional weight (mass). If you shot the original X bullets versus the TSX's, with the grooves cut in the bearing surface, this would make more sense. Since solid copper bullets are long for their weight they tend to have longer bearing surfaces which equals more drag. Grooving the exterior reduces the drag at the expense of BC. I'm not sure why they don't make the grooves look more like waves along the exterior instead of sharp edged grooves. That to me would reduce drag due to less sharp edges. It would be a rather simple process with a lathe turned bullet. The originals were pretty slow and fouled bad not to mention their on game performance wasn't very good due to the shallow and small hollow point. [/QUOTE]
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Hornady ELD-X Official Thread
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