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Long Range Hunting & Shooting
.300 Winchester Magum Bullet Choice - Expanded
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<blockquote data-quote="Jon A" data-source="post: 95131" data-attributes="member: 319"><p>What brand of chronograph are you using? And are you chronographing under all these conditions at all the differing altitudes? (I recently found "temp insensitive" Retumbo and 50BMG did, in fact, drop the velocities in cold weather more than I thought they would.)</p><p></p><p>Rick Jamison should be highly commended for actually measuring and publishing BC's. Of all the thousands of pages of gun rags...you'd think more than one person would do it but he seems to be the only one who ever has. I'd like to personally thank him for his efforts....</p><p></p><p>That said, the BC's he measures are always low for <em>all the bullets</em> he measures. Correcting for environmental conditions, using the time of flight method (maybe his target is a fraction of an inch too far?), I don't know exactly the reason but they're always low.</p><p></p><p>What makes them useful, and what so many others miss, is that he doesn't just measure one bullet. He measures a bunch so if there are errors in his setup you can still compare them to each other relatively. Sort of the whole "control" part of the scientific method that many miss by simply posting anecdotal results from a single bullet.</p><p></p><p>I don't think I saw the article you're talking about, but a few years ago he measured the 180 BT at .443. But he also measured the SST at only .454 and Scirocco at .460. And those were the three highest out of all the 180's he measured in that test. The 180 X (advertised .511) only measured .370. The 200 X (advertised at .550) measured .405. None measured over .476, the highest in this particular test--which was the 200 Sierra Gameking, advertised .560. </p><p></p><p>His efforts testing and his results are great data if you just know how to look at it. So the numbers are skewed low--that's OK because they're skewed the same amount for all the bullets he tests so you can still compare bullet to bullet and see who wins the race.</p><p></p><p>In this particular test, he measured 14 different 180s. The BT was the 3rd highest, just a hair behind the SST and Scirocco. Just exactly where it should be from an Engineering standpoint looking at the bullets' shapes. So it's good data. <em><strong>Relatively speaking.</strong></em></p><p></p><p>In the test you read, what other bullets did he test? How did they do?</p></blockquote><p></p>
[QUOTE="Jon A, post: 95131, member: 319"] What brand of chronograph are you using? And are you chronographing under all these conditions at all the differing altitudes? (I recently found "temp insensitive" Retumbo and 50BMG did, in fact, drop the velocities in cold weather more than I thought they would.) Rick Jamison should be highly commended for actually measuring and publishing BC's. Of all the thousands of pages of gun rags...you'd think more than one person would do it but he seems to be the only one who ever has. I'd like to personally thank him for his efforts.... That said, the BC's he measures are always low for [i]all the bullets[/i] he measures. Correcting for environmental conditions, using the time of flight method (maybe his target is a fraction of an inch too far?), I don't know exactly the reason but they're always low. What makes them useful, and what so many others miss, is that he doesn't just measure one bullet. He measures a bunch so if there are errors in his setup you can still compare them to each other relatively. Sort of the whole "control" part of the scientific method that many miss by simply posting anecdotal results from a single bullet. I don't think I saw the article you're talking about, but a few years ago he measured the 180 BT at .443. But he also measured the SST at only .454 and Scirocco at .460. And those were the three highest out of all the 180's he measured in that test. The 180 X (advertised .511) only measured .370. The 200 X (advertised at .550) measured .405. None measured over .476, the highest in this particular test--which was the 200 Sierra Gameking, advertised .560. His efforts testing and his results are great data if you just know how to look at it. So the numbers are skewed low--that's OK because they're skewed the same amount for all the bullets he tests so you can still compare bullet to bullet and see who wins the race. In this particular test, he measured 14 different 180s. The BT was the 3rd highest, just a hair behind the SST and Scirocco. Just exactly where it should be from an Engineering standpoint looking at the bullets' shapes. So it's good data. [i][b]Relatively speaking.[/b][/i][b][/b] In the test you read, what other bullets did he test? How did they do? [/QUOTE]
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