Data in the Lyman manual..... [Archive] - Glock Talk

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racer11
07-29-2012, 21:32
For each caliber load data listed I see under each bullet..

BC and a length in thousands and SD and a length in thousands.

What measurement are they giving me and how do I use it in my reloading. I know what OAL stands for but not BC & SD.

Pulling my hair out.....LOL

zippyhuntin
07-30-2012, 06:11
Neither one is a length.

BC is ballistic coefficent.
https://en.wikipedia.org/wiki/Ballistic_coefficient

SD is probably sectional density.
http://www.chuckhawks.com/sd_beginners.htm

racer11
07-30-2012, 06:59
Ok,,, Thanks

fredj338
07-30-2012, 08:55
BC & SD are ballistics numbers, completely unrelated to reloading safety. Read the book, it tells you what the numbes mean.

Zombie Steve
07-30-2012, 09:16
BC & SD are ballistics numbers, completely unrelated to reloading safety. Read the book, it tells you what the numbes mean.


Sometimes I imagine Fred like this:

http://pokerknave.com/files/2009/08/spock.jpg

While I feel like this:

http://d3rm69wky8vagu.cloudfront.net/article-photos/large/145763.png

fredj338
07-30-2012, 13:03
:ufo:^^Only on Halloween!!