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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
Weight a factor of BC?
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<blockquote data-quote="longestrange" data-source="post: 2103500" data-attributes="member: 75265"><p>If your bullets are the same size and shape, then they have the same diameter and form factor. If one weighs twice as much, the BC will be double the other one.</p><p></p><p>SD = w / d^2</p><p>BC = SD / i</p><p>SD = sectional density</p><p>w = weight (not mass)</p><p>d = diameter</p><p>i = form factor</p><p>BC = Ballistic Coefficient</p><p></p><p>Form factors are much more complicated. G7 BC's are based upon a typical longrange boattail bullet 'form'. G1 BC's based on flat based bullet 'form'. BC's are dependent on velocity as well. You will want to use the G7 BC for a long range boattail bullet if it is published.</p><p></p><p>Either way, your heavy bullet BC will be double the light bullet BC, since the form factors are identical.</p></blockquote><p></p>
[QUOTE="longestrange, post: 2103500, member: 75265"] If your bullets are the same size and shape, then they have the same diameter and form factor. If one weighs twice as much, the BC will be double the other one. SD = w / d^2 BC = SD / i SD = sectional density w = weight (not mass) d = diameter i = form factor BC = Ballistic Coefficient Form factors are much more complicated. G7 BC's are based upon a typical longrange boattail bullet 'form'. G1 BC's based on flat based bullet 'form'. BC's are dependent on velocity as well. You will want to use the G7 BC for a long range boattail bullet if it is published. Either way, your heavy bullet BC will be double the light bullet BC, since the form factors are identical. [/QUOTE]
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Weight a factor of BC?
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