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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
Hornady ELD-X Official Thread
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<blockquote data-quote="AaronSkipDavidson" data-source="post: 1133738" data-attributes="member: 6373"><p>Bearing surface vs pressure.</p><p></p><p>If you look at the ammo lineup that many of these bullets will be featured in, you'll notice that the 30 cal 212 and 7mm 175 aren't listed. The other 7mm and 30 cal bullets are set up to run in factory cartridges in std magazines. </p><p></p><p>When you get away from seat of the pants pressure testing, its pretty easy to measure the effect of different bullet shapes and construction including bearing length, the effects of varying bullet/lands relationship, and the effect of bullet protrusion into case volume. By far, case volume is the significant variable. For similar bullet shapes, the small variation in bearing surface only contributes approx 15 fps - that's inside the ES of your ammo!</p><p></p><p>I suspect that the anecdotal evidence of "faster" for different bullet designs has to do with variations in case capacity due to bullet shape and seating depth.</p><p></p><p>We've got a great load for the 300 RUM that is shooting about 3175 fps with the 212 ELD-X, but its not loaded to 65,000 psi. I'll share some real numbers from SAAMI chambers asap.</p></blockquote><p></p>
[QUOTE="AaronSkipDavidson, post: 1133738, member: 6373"] Bearing surface vs pressure. If you look at the ammo lineup that many of these bullets will be featured in, you'll notice that the 30 cal 212 and 7mm 175 aren't listed. The other 7mm and 30 cal bullets are set up to run in factory cartridges in std magazines. When you get away from seat of the pants pressure testing, its pretty easy to measure the effect of different bullet shapes and construction including bearing length, the effects of varying bullet/lands relationship, and the effect of bullet protrusion into case volume. By far, case volume is the significant variable. For similar bullet shapes, the small variation in bearing surface only contributes approx 15 fps - that's inside the ES of your ammo! I suspect that the anecdotal evidence of "faster" for different bullet designs has to do with variations in case capacity due to bullet shape and seating depth. We've got a great load for the 300 RUM that is shooting about 3175 fps with the 212 ELD-X, but its not loaded to 65,000 psi. I'll share some real numbers from SAAMI chambers asap. [/QUOTE]
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Hornady ELD-X Official Thread
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