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Ballistic Coefficient Question
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<blockquote data-quote="MontanaRifleman" data-source="post: 900713" data-attributes="member: 11717"><p>If you run the 7mm 180 VLD against the 308 185 VLD, the 7mm will eventually catch up to the 308 185, but it will be a lot farther down range than 500 yds and it is basically comparing apples to oranges. You are comparing the highest 7mm BC bullet to a med 308 BC bullet. The 300 WM will shoot the 185 200 fps faster or more, than the 7 RM will shoot the 180.</p><p></p><p>A better comparison is the 7mm 180 vs the 308 215. The 300 WM will shot the 215 just as fast as the 7 RM will shoot the 180. Advantage goes to the 300 WM, big time.</p><p></p><p>The 3020 fps velocity you are quoting is very high for a 7 RM shooting a 180. Not impossible but definitely on the upper end. My max for a 160 bullet using Retumbo out of a 24" barrel was 3100. A 180 bullet would have been more than 200 fps slower. 215's are usually in the 2950-3050 range out of a 300 WM, depending on barrel length. So you see, when you compare apples to apples the larger cartridge will win every time. There is no magic or voodoo that overcomes the physical laws of nature.</p></blockquote><p></p>
[QUOTE="MontanaRifleman, post: 900713, member: 11717"] If you run the 7mm 180 VLD against the 308 185 VLD, the 7mm will eventually catch up to the 308 185, but it will be a lot farther down range than 500 yds and it is basically comparing apples to oranges. You are comparing the highest 7mm BC bullet to a med 308 BC bullet. The 300 WM will shoot the 185 200 fps faster or more, than the 7 RM will shoot the 180. A better comparison is the 7mm 180 vs the 308 215. The 300 WM will shot the 215 just as fast as the 7 RM will shoot the 180. Advantage goes to the 300 WM, big time. The 3020 fps velocity you are quoting is very high for a 7 RM shooting a 180. Not impossible but definitely on the upper end. My max for a 160 bullet using Retumbo out of a 24" barrel was 3100. A 180 bullet would have been more than 200 fps slower. 215's are usually in the 2950-3050 range out of a 300 WM, depending on barrel length. So you see, when you compare apples to apples the larger cartridge will win every time. There is no magic or voodoo that overcomes the physical laws of nature. [/QUOTE]
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