I have used Jae-Bok Young, Cast Performance and Beartooth cast bullets.
I load from 325gr to 405gr hard cast gas checked bullets in my 4.25" & 7.5" Ruger SRH 454 Casull's.
I get with 360gr C/P WLNGC's 1520fps and 395gr C/P WLNGC's @ 1420fps in my 7.5" barreled SRH.
PM me and I'll give you some reload data to start with...