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Hunting
Long Range Hunting & Shooting
True BC of a 220MK
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<blockquote data-quote="Mysticplayer" data-source="post: 3055" data-attributes="member: 8947"><p>The big unknown is the effect your barrel has on the bullet. I believe that Sierra bases their BC on actual shooting over chronographs. That is why their BC's vary with velocity. Most other companies base theirs on a shape formula and can vary alot in the real world.</p><p></p><p>The only way to get a true BC for a bullet is to fire it from your rifle and measure its speed or drop over known distances.</p><p></p><p>Ian M. has been doing some of that and might have some results to compare with yours. I have only found the published BC to agree once out of a lot of different bullets and rifles.</p><p></p><p>Good luck...</p><p></p><p>Jerry</p></blockquote><p></p>
[QUOTE="Mysticplayer, post: 3055, member: 8947"] The big unknown is the effect your barrel has on the bullet. I believe that Sierra bases their BC on actual shooting over chronographs. That is why their BC's vary with velocity. Most other companies base theirs on a shape formula and can vary alot in the real world. The only way to get a true BC for a bullet is to fire it from your rifle and measure its speed or drop over known distances. Ian M. has been doing some of that and might have some results to compare with yours. I have only found the published BC to agree once out of a lot of different bullets and rifles. Good luck... Jerry [/QUOTE]
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True BC of a 220MK
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