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Help Needed....MV Validation Puzzle
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<blockquote data-quote="CB11WYO" data-source="post: 828728" data-attributes="member: 57339"><p>Hunter,</p><p>If I may... (and there's many on here who understand this much better than I do...) </p><p></p><p>I seemed to have this problem with a friends 22-250. My calculations were good to 350 or 400 yds but at 600 or so the bullets were hitting quite a bit low. As a bullet flies downrange and decreases in veloctiy it also loses BC value. This is one reason that on Sierra's website they list multiple BCs for a given bullet, based on the veloctiy. </p><p></p><p>EX: A .224 cal 55gr Sierra BlitzKing has a BC of .271 @ 3100 fps and above. But they also list the following: </p><p>BC= .264 between 3100 and 2550 fps; </p><p>.250 between 2550 and 2050 fps; </p><p>.236 between 2050 and 1800 fps; </p><p>.224 @ 1800 fps and below</p><p><a href="https://www.sierrabullets.com/store/product.cfm/sn/1455/224-dia-55-gr-BlitzKing" target="_blank">https://www.sierrabullets.com/store/product.cfm/sn/1455/224-dia-55-gr-BlitzKing</a></p><p></p><p>For my friend's 22-250 I had an original starting BC which was good from 0-400 yds and then a lower BC which was valid from 400-600 yds, etc...</p><p></p><p>Hope that made some sort of sense... maybe someone with more experience will chime in as well...</p><p></p><p>-Clint</p></blockquote><p></p>
[QUOTE="CB11WYO, post: 828728, member: 57339"] Hunter, If I may... (and there's many on here who understand this much better than I do...) I seemed to have this problem with a friends 22-250. My calculations were good to 350 or 400 yds but at 600 or so the bullets were hitting quite a bit low. As a bullet flies downrange and decreases in veloctiy it also loses BC value. This is one reason that on Sierra's website they list multiple BCs for a given bullet, based on the veloctiy. EX: A .224 cal 55gr Sierra BlitzKing has a BC of .271 @ 3100 fps and above. But they also list the following: BC= .264 between 3100 and 2550 fps; .250 between 2550 and 2050 fps; .236 between 2050 and 1800 fps; .224 @ 1800 fps and below [url]https://www.sierrabullets.com/store/product.cfm/sn/1455/224-dia-55-gr-BlitzKing[/url] For my friend's 22-250 I had an original starting BC which was good from 0-400 yds and then a lower BC which was valid from 400-600 yds, etc... Hope that made some sort of sense... maybe someone with more experience will chime in as well... -Clint [/QUOTE]
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