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Rifles, Reloading, Optics, Equipment
Reloading
Question on bullet weight consistency
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<blockquote data-quote="rscott5028" data-source="post: 497738" data-attributes="member: 24624"><p>I may be all wet. (again) but...</p><p> </p><p>As I see it, a 139g bullet with a .284 dia and a .486 BC must have a SD=0.2462 and a form factor=.5066. </p><p> </p><p>If the form factor remains constant and you vary the weight from 138.2 to 141.1, then the BC would vary from .483 to .493. </p><p> </p><p>If all of those assumptions and calculations were true, then the 138g bullet fired @ 2900 fps will drop ~325" at 1k vs ~320" for the 141g bullet. </p><p> </p><p>Hence, a 5" vertical spread from change in mass alone. </p><p> </p><p>Other factors such as MV and form factor may not remain constant. So, that whole line of reasoning may be flawed. </p><p> </p><p>-- richard</p></blockquote><p></p>
[QUOTE="rscott5028, post: 497738, member: 24624"] I may be all wet. (again) but... As I see it, a 139g bullet with a .284 dia and a .486 BC must have a SD=0.2462 and a form factor=.5066. If the form factor remains constant and you vary the weight from 138.2 to 141.1, then the BC would vary from .483 to .493. If all of those assumptions and calculations were true, then the 138g bullet fired @ 2900 fps will drop ~325" at 1k vs ~320" for the 141g bullet. Hence, a 5" vertical spread from change in mass alone. Other factors such as MV and form factor may not remain constant. So, that whole line of reasoning may be flawed. -- richard [/QUOTE]
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Rifles, Reloading, Optics, Equipment
Reloading
Question on bullet weight consistency
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