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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
Are you thinking of BC the wrong way?
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<blockquote data-quote="BryanLitz" data-source="post: 1309427" data-attributes="member: 7848"><p>Good point on BC's not fitting some bullets; Even G7 isn't always a good enough drag model for some bullets especially at ELR.</p><p></p><p>This is where Custom Drag Models (CDM's) come in. CDM's model the actual drag of a specific bullet, with no regard to a 'standard'. The bullet is it's own standard. This is the most accurate way of modeling drag.</p><p></p><p>For 'normal' long range, BC's even with their errors are still good enough for nearly anything in the supersonic range of flight. It's only when you get to transonic and ELR distances that the fidelity of the CDM makes the difference between a hit and a miss.</p><p></p><p>Another benefit of BC's is that they provide a means for comparison. It's one quick number that indicates a bullets performance, which you can compare to another bullet. CDM's don't use comparisons, and it takes an entire table to characterize a CDM so it's not easy to compare bullets.</p><p></p><p>So despite their shortcomings for ELR application, I don't expect BC's to ever go away completely.</p><p></p><p>-Bryan</p></blockquote><p></p>
[QUOTE="BryanLitz, post: 1309427, member: 7848"] Good point on BC's not fitting some bullets; Even G7 isn't always a good enough drag model for some bullets especially at ELR. This is where Custom Drag Models (CDM's) come in. CDM's model the actual drag of a specific bullet, with no regard to a 'standard'. The bullet is it's own standard. This is the most accurate way of modeling drag. For 'normal' long range, BC's even with their errors are still good enough for nearly anything in the supersonic range of flight. It's only when you get to transonic and ELR distances that the fidelity of the CDM makes the difference between a hit and a miss. Another benefit of BC's is that they provide a means for comparison. It's one quick number that indicates a bullets performance, which you can compare to another bullet. CDM's don't use comparisons, and it takes an entire table to characterize a CDM so it's not easy to compare bullets. So despite their shortcomings for ELR application, I don't expect BC's to ever go away completely. -Bryan [/QUOTE]
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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
Are you thinking of BC the wrong way?
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