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 August 29, 2005, 12:48 AM #1 William_IV Member   Join Date: March 4, 2005 Location: Phoenix AZ Posts: 76 Lyman 48th edition Handbook Question. In every load recipe in the top right hand corner there is 2 numbers I couldn't find out from the book what these numbers referred to. Example on page 356 upper right corner says BC: .139 and right below it says................................SD: .130 Yeah i'm new to this...! I think SD= Sectional Density but i'm not sure. BC=??? I have not..A.. clue... Does anyone want to enlighten me?
 August 29, 2005, 01:53 AM #2 BigSlick Senior Member   Join Date: January 25, 2005 Location: Texas of course Posts: 277 BC=Ballistic Coefficient __________________ Nobody likes war, but if you find yourself in one - fight for those you serve with and to make the trip home. Show mercy to those that deserve it and a relentless, ruthless, cunning evil to those who don't.
 August 29, 2005, 01:53 AM #3 DAVID NANCARROW Senior Member   Join Date: November 5, 2000 Location: TEXAS Posts: 1,751 BC=balllistic coefficient of friction. i.e., how well the bullet flies through the air.
 August 31, 2005, 12:27 AM #4 Smokey Joe Senior Member   Join Date: July 14, 2001 Location: State of Confusion Posts: 2,106 Sectional density S. D. of a bullet is its weight in pounds divided by the square of its diameter in inches. Well, so what?? This is what: "The higher the S. D. of a bullet in a given diameter, the heavier and longer that bullet will be. This is important to several factors, including the B. C. of the bullet. However, from a big game hunter's standpoint the most relevant measure of S. D. is that with all else being equal, the higher the S. D. of a bullet, the better its ability to penetrate." Lyman's 48th edition Reloading Manual, pg. 105 Same source: "The ability of a bullet to retain its velocity is expressed as the ballistic coefficient. This is a measure of how aerodynamic a bullet is and how well it cuts through the air." The higher the number, the better the bullet slips through the air, and the less velocity it loses over a given distance. Bottom line: All else being equal, longer, heavier, pointier-nosed bullets go through both air and targets better than shorter, fatter, rounder-nosed bullets. Simple, no? __________________ God Bless America --Smokey Joe

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