BC for 45-70 Postell slug

[jefats]

Does anyone know the BC on a 500 Postell bullet in 45-70?

Thanks

[floodgate]

jefats:

By coincidence, I was just reading Dr. Richard Gunn's article on BP bullet ballistic coefficients in the 2007, Edition 1, issue of C. Sharps' "The American Sharps Shooter"; he ran tests with multiple chronographs and got BC = .43 for the current 529-gr. Lyman Postell bullet in the trans-sonic region.

floodgate

[John Boy]

L457132 Postell 535gr 1:20 ... 361 BC