Reloading 460 S&W

Has anyone out there been reloading the 460 S&W. I found loading data in the Speer reloading book but it only give info for 250 & 300 grain bullets. I am wanting to load 200 grain flex tip bullets. My barrel is 14" long if that makes a difference. Also they give about 5 or 6 different type powders. If anyone has been reloading them with success, please let me know what you use and what type primers.
Thanks