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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
Let's argue about BC's
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<blockquote data-quote="rscott5028" data-source="post: 479203" data-attributes="member: 24624"><p>MontanaRifleman,</p><p> </p><p>I'm not trying to tell anyone how it is. I'm just trying to understand what you and others have learned through research. And, I respect your wisdom and experience which far exceeds mine. </p><p> </p><p>As you acknowledged, the barrel engraves the exterior of the bullet. Not so much the head/ogive/meplat/boat tail which I assume has a larger influence on BC as compared to the bearing surface that gets etched. But, I think it has some affect which you and others say is very little. Perhaps even a tight barrel due to manufacturing tolerances or fouling may squeeze the OD enough to have an influence on BC? </p><p> </p><p>So, while that little bit may be infintessimal at shorter ranges, I'm seeing credible sources saying that it's noteworthy at extreme ranges. </p><p> </p><p>What I'm gathering from this thread is that BCs are imperfect to begin with. And, they are simply a mechanism to model the trajectory of a bullet giving us some predictability of where the bullet will intersect its target. Afterall, nobody practices at every 1 yard increment from 100-2000 yds. </p><p> </p><p>As such, it seems reasonable to tweak the BC slightly for your rifle. But, any major fudging is likely due to either a misrepresented published BC or a wrong assumption on the part of the shooter. </p><p> </p><p>In the case of the published BC, it's public forums like this which will likely bring that to light. </p><p> </p><p>Whereas tweaking the BC substantially due to invalid assumptions about scope height/tracking, MV, etc.. is only going to set you up for disapointment under some set of conditions down the road. </p><p> </p><p>Thanks,</p><p>Richard</p></blockquote><p></p>
[QUOTE="rscott5028, post: 479203, member: 24624"] MontanaRifleman, I'm not trying to tell anyone how it is. I'm just trying to understand what you and others have learned through research. And, I respect your wisdom and experience which far exceeds mine. As you acknowledged, the barrel engraves the exterior of the bullet. Not so much the head/ogive/meplat/boat tail which I assume has a larger influence on BC as compared to the bearing surface that gets etched. But, I think it has some affect which you and others say is very little. Perhaps even a tight barrel due to manufacturing tolerances or fouling may squeeze the OD enough to have an influence on BC? So, while that little bit may be infintessimal at shorter ranges, I'm seeing credible sources saying that it's noteworthy at extreme ranges. What I'm gathering from this thread is that BCs are imperfect to begin with. And, they are simply a mechanism to model the trajectory of a bullet giving us some predictability of where the bullet will intersect its target. Afterall, nobody practices at every 1 yard increment from 100-2000 yds. As such, it seems reasonable to tweak the BC slightly for your rifle. But, any major fudging is likely due to either a misrepresented published BC or a wrong assumption on the part of the shooter. In the case of the published BC, it's public forums like this which will likely bring that to light. Whereas tweaking the BC substantially due to invalid assumptions about scope height/tracking, MV, etc.. is only going to set you up for disapointment under some set of conditions down the road. Thanks, Richard [/QUOTE]
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Let's argue about BC's
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