Something else to keep in mind, the BC of a bullet changes with it's velocity.
For example according to Sierra their 300 gr 44 JSP has a BC of .230 @ 1200 fps and above, .250 between 1200 and 900 fps and .195 @ 900 fps and below.
http://www.sierrabullets.com/bullets/index.cfm?fuseaction=Ballistic
For example according to Sierra their 300 gr 44 JSP has a BC of .230 @ 1200 fps and above, .250 between 1200 and 900 fps and .195 @ 900 fps and below.
http://www.sierrabullets.com/bullets/index.cfm?fuseaction=Ballistic