The frame is an SB2, good for 270win pressures and case head thrust, that puts it good up to and including the 460S&W in my book since that's what mines gonna be soon!!
![Wink ;)](https://www.gboreloaded.com/forums/Smileys/default/wink.gif)
Wayne York has done several to Casull which are doing fine, the loads that I've shot in mine so far are Ruger 45 Colt loads from Hodgdon, in fact I went 1gr over with lil'gun cuz I'm using a longer COL and 250gr XTP data, 1.673" with the Speer bullet, 1.941" with the SST, same data.
Tim