I'm looking for data for a 200gr cast slug to use in the 454. The gun is a raging bull, if I can use 45 Colt data in the 454 case that would be super. Thanks in advance....lost

use the 45 LC data - after all that is what the 454 came from

You can certainly use 45colt data but vel. will be about 50fps less because of the greater volumn of the 454 brass.