Actually, i just called Cinch River boys. They make a 147 gr., but they're not sure what it's B.C. is, as it's never been tested for such. They're assuming somewhere in the lower to mid 6's. Both the 140 JLK, and Berger are .630, so... According to what they told me, that bullet just set the new 1000 yd. record at around 1.5" 5 shots-- i believe.