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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
7mm Rem. Mag vs 300 Win. Mag
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<blockquote data-quote="chuckhammer" data-source="post: 1087431" data-attributes="member: 25816"><p>The physically accurate way to compare bullet sectional density across calibers is mass/sectional area rather than mass/caliber.</p><p></p><p>For example:</p><p>180 grains / (.284"^2) = 2231.7 grains/sq.in.</p><p>215 grains / (.308"^2) = 2266.4 grains/sq.in.</p><p></p><p>In other words, a 7mm bullet weighing 182.8 grains would have identical sectional density to a 30-cal 215 per the below calculation.</p><p></p><p>2266.4 grains/sq.in. * (.284"^2) = 182.8 grains</p><p></p><p></p><p>Regarding the topic at hand, it is both the increased case capacity (9 gr H2O) and the availability of higher-BC bullets that give the 300WM that windage advantage over 7RM. However, for us wildcatters, an improved 7-300WM shooting 180 Hybrids at 3200 fps just edges out the 300WM with a 230 Hybrid at 2900 fps for the same amount of powder. More so once the 195 Hybrid hits the streets.</p><p></p><p>That's assuming you can get a 230 Hybrid to hit 2900 fps from a 28" bbl 300WM.</p></blockquote><p></p>
[QUOTE="chuckhammer, post: 1087431, member: 25816"] The physically accurate way to compare bullet sectional density across calibers is mass/sectional area rather than mass/caliber. For example: 180 grains / (.284"^2) = 2231.7 grains/sq.in. 215 grains / (.308"^2) = 2266.4 grains/sq.in. In other words, a 7mm bullet weighing 182.8 grains would have identical sectional density to a 30-cal 215 per the below calculation. 2266.4 grains/sq.in. * (.284"^2) = 182.8 grains Regarding the topic at hand, it is both the increased case capacity (9 gr H2O) and the availability of higher-BC bullets that give the 300WM that windage advantage over 7RM. However, for us wildcatters, an improved 7-300WM shooting 180 Hybrids at 3200 fps just edges out the 300WM with a 230 Hybrid at 2900 fps for the same amount of powder. More so once the 195 Hybrid hits the streets. That's assuming you can get a 230 Hybrid to hit 2900 fps from a 28" bbl 300WM. [/QUOTE]
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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
7mm Rem. Mag vs 300 Win. Mag
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