Old 139 gr Hornady HP FB unknown BC

[Grant Mauser]

Hey Guys, Picked up a bunch of hornady 139 gr flat base, HP bullets.. They were in yellow boxes with no numbers or markings on them. I called Hornady to find out the BC. but the guy on the phone had no clue and didn't feel like looking ... So . based on a soft point bullet they have. I was thinking around 380 or 390 maybe for BC.. no cannalure on them... Gonna shoot them in my 708 rem...Thanks

 

[Kurz]

You can use the JMB BC Calculator but it needs you to record the velocity at the muzzle and at 100 yards. Then fill in the blanks

http://www.jbmballistics.com/cgi-bin/jbmbcv-5.1.cgi

Now, taking that BC, shoot a drop chart. Adjust the BC until it matches your drop chart.

 

[Grant Mauser]

ok, thanks, check it out