Chapman -

the .245 BC Hornady are the .430 - 300's. Makes sense it would be higher than a 300 in .452, though I don't know it would be that much higher. Hornady shows the .452 - 300's at BC of .20.

Here's a table to clarify:

From Hornady; BC SD

10MM-200 .199 .179

.430 - 300 .245 .232

.452 - 300 .20 .21

From Speer:

.452 - 300 .233 .21