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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
300rum, 200gr, 3200fps how???
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<blockquote data-quote="Fiftydriver" data-source="post: 558168" data-attributes="member: 10"><p>Comparing the 160 gr AB in the 7mm RUM to the 300 RUM with 200 gr AB will give the 30 cal an advantage in kenetic energy and also bullet frontal area. This means that it starts larger in diameter and it will expand to a larger diameter while retaining a good bullet shank length meaning that as it penetrates to roughly the same depth as the 7mm 160 gr, it will displace more vital tissue then the smaller caliber bullet. Just a simple fact. So, if your hunting larger game, certainly the larger caliber will effect more vital tissue then any smaller caliber bullet of same design, sectional density and at similiar impact velocity.</p><p> </p><p>Now, lets look at a different bullet, if you look at the 180 gr Berger VLD, you get a dramatic boost in BC even over the 200 gr Accubond in 30 cal. The 7mm RUM will drive the 180 to 3100-3150 fps pretty easily. In a long barreled custom rifle, the 7mm RUM will get you up to 3200 fps. Throw that in with a BC in the .680 range, it really narrows the performance gap. Velocity is similiar, BC in favor of the 7mm and sectional density now in favor of the 7mm. So it makes the comparision much harder to pick a true winner.</p><p> </p><p>The 30 cal still has the larger frontal area in its corner but all other areas are much closer when you use the best bullets in the 7mm family.</p></blockquote><p></p>
[QUOTE="Fiftydriver, post: 558168, member: 10"] Comparing the 160 gr AB in the 7mm RUM to the 300 RUM with 200 gr AB will give the 30 cal an advantage in kenetic energy and also bullet frontal area. This means that it starts larger in diameter and it will expand to a larger diameter while retaining a good bullet shank length meaning that as it penetrates to roughly the same depth as the 7mm 160 gr, it will displace more vital tissue then the smaller caliber bullet. Just a simple fact. So, if your hunting larger game, certainly the larger caliber will effect more vital tissue then any smaller caliber bullet of same design, sectional density and at similiar impact velocity. Now, lets look at a different bullet, if you look at the 180 gr Berger VLD, you get a dramatic boost in BC even over the 200 gr Accubond in 30 cal. The 7mm RUM will drive the 180 to 3100-3150 fps pretty easily. In a long barreled custom rifle, the 7mm RUM will get you up to 3200 fps. Throw that in with a BC in the .680 range, it really narrows the performance gap. Velocity is similiar, BC in favor of the 7mm and sectional density now in favor of the 7mm. So it makes the comparision much harder to pick a true winner. The 30 cal still has the larger frontal area in its corner but all other areas are much closer when you use the best bullets in the 7mm family. [/QUOTE]
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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
300rum, 200gr, 3200fps how???
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