I have a CVA Hunter in 450 Bushmaster and would like some cast bullet advise.  I am looking for plinking loads for 200, 230, and 255 grain bullets.  I know it is a much larger case, but would 45 Colt data (for Ruger and other high strength guns) work as a starting point?  I have several powders that the latest Hodgdon reloading manual suggests (IMR4227, L'IL Gun, and Longshot).  Any thoughts on the matter?  My thanks in advance for any help sent my way.