Peddler - my old Lyman manual has the following loads for the 7.62x54R with the 150 gn bullet: IMR 3031: 41 - 46 gns for 2518 - 2785'/sec. IMR 4064 goes 44 - 49 gns for 2427 - 2793'/sec. The accuracy load listed with that bullet was IMR 4350 powder with 55 gns showing 2695'/sec.
Now, go to Steve's pages for some great data. HTH. Mikey.