I'm thinking of converting my Gen 3 21 or Gen 4 21 that I'll get in Jan.2013 to a .460 Rowland. Anyone have load data that they have used in their 21 converted to .460 Rowland and chronograph results for185gr- 230gr. bullets? I have used .45 Supers in my Gen3 21(properly set-up, of course) before and wonder if there is that much increase in power going to the .460 Rowland over a .45 Super? I know the operating pressures are a good bit more in the .460 over the .45 Super. Thanks!