Hornady #6615 ballistic coeff estimate?

[gareth96]

Buddy just came over and shot his muzzleloader.. He was using old Hornady 325 gr 45cal bullets (#6615).. solid lead with 4 lube bands. I thought we might be able to use my labradar to get velocity, but I guess the smoke got in the way. He'd like to get a speed, and we know the drop.. about 8.5" at 130yds when zero is 50yds.

Anyone have a BC estimate for a bullet like this? With that I can zero in on the speed using JBM ballistics..

THanks

[tazman]

NOE has a very similar boolit and lists the BC as .2400.