I have never fired a factory loaded 7.62x54R. The brass, which I've been using for handloads, is Norma.
I don't mean for this answer to be snarky. My point is that I agree with Mr. "Stubbicatt":
The time for cheap mosin ammo and especially cheap mosin nagant rifles may be drawing to a close. If I run across another mosin in good condition and at a reasonable price, I will likely take it home.