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November 24, 2013, 01:26 PM
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#1 |
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Member
Join Date: September 16, 2013
Posts: 17
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NoooooBeeee Question
Have been a lurker for a while. Reloading .45ACP and 9mm and have started working up knowledge to reload .308 and 270 Win. Now the dumb question: Looking at load data there is a BC number (I got that one) and a SD number. What they hey is "SD" and what does it mean?
Thanks ahead of time. Geek |
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November 24, 2013, 01:35 PM
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#2 |
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Senior Member
Join Date: March 18, 2010
Location: Orem, Utah
Posts: 244
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Sectional Density, a higher sectional density for a give caliber usually the better.
However their is someone on here that's going to explain a heck of a lot better then I can.
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November 24, 2013, 06:20 PM
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#3 |
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Senior Member
Join Date: March 12, 2011
Location: Washington state
Posts: 1,558
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Wikipedia has a decent description http://en.m.wikipedia.org/wiki/Sectional_density. Sectional density will be the same for any caliber / bullet weight. It helps determine penetrating capability of a bullet. But it does not reflect the construction of the bullet. So it is not the end all, be all of penetration.
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You can't fix stupid....however ignorance can be cured through education! |
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November 25, 2013, 08:04 AM
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#4 |
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Senior Member
Join Date: February 9, 2005
Location: Owego, NY
Posts: 2,000
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In general higher sectional density will have two benefits, 1) it will buck air resistance better, 2) it will have better penetration.
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November 25, 2013, 10:14 AM
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#5 |
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Member
Join Date: September 16, 2013
Posts: 17
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Got It
Thanks to all for the answer here.
G |
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