That would be nice, but i'm sure it's not close to that.

Lyman lists the .54 cal 430gr at .160. They list the .50 at .95 which has to be a mistake for the 370gr. Hell, a round ball is .70

The .54 is heavier than the .50 which should give it a better BC, but it bigger in diameter which takes BC away.

That's why I guess they may be similar. I guessed the .50 at .150.