I reload three brands of 7.62x54 R brass by my MN 1891/30 rifle.
Winchester metric, that I purchased as loaded ammo. Century brass that I pruchased as loaded ammo, and Graff and sons ammo.
I like the Winchester the best, graff second and Century third. The Century ammo had a crimp around the primer that had to be removed. It was a pain to remove. The Winchester was just sweet from the get-go. The Graff's is nice and I have no complaints.
I bought most of my Winchester and the one box of Century at gunshows for under $10/box of 20. The Graffs I bought over the internet. Midway has Winchester metric loaded ammo.
The biggest problem I have had with reloading 7.62x54 ammo was that my Lee dies only had a .308 expander ball. I needed to take the .310 expander/depriming pin from my 7.62x39 Lee die set and install it in the 7.62x54 sizing die. This allowed me to later seat .310 to .312 bullets more easily.