I am reloading my 7.62x54R for an MN1891/30 (mostly Winchester brass), Winchester Large Rifle primer.
My MN 1891/30 with the rear sight all the way down and a roll pin raising the front sight shoots dead center with a 6PM hold at 100 yards on an NRA target using handloaded 0.310 dia bullet, 180 grain Remington Corelokt bullets and 41.8 grains H4895.
For cast lead bullets with a 175 grain, gas-checked, cast lead bullet BN=20 hardness, 33.6 grains H-4895, (no change in front sight adjustment from above) adjusting rear sight to a 400 meter/yard setting, X-Ring with 6PM hold on an NRA target at 100 yards. Bullet sized to 0.311.
For cast lead bullets with a 155 grain gas-checked bullet, between 15.3 and 15.6 grains of Alliant 2400 powder, the rear sight adjusted to the 500 meter mark they were dead on with a 6 pm hold at 100 yards. Bullet sized to 0.311 inch diameter. This is a much reduced powder load having very little recoil.
I tried working up some loads for 115 grain cast bullets, but had a hard time with accuracy on them. I did get some on paper loads that weren't too bad at 50 yards using 5 to 7 grains of Hodgdon TiteGroup powder.