I need to get some surplus ammo to feed my SVT rifles. If given the choice my preference would be: Czech, Russian then Chinese.
I can only base this off my experience with 7.62x39. The Czech stuff offered really decent accuracy out of my CZ 858 along with expected perfect reliability. Other posters have also confirmed the same results that the czech stuff was more accurate for them.
Of course the individual firearm, barrel length, twist rate, chrome lined etc will also all affect these results.
On a side note, I really don't fear corrosive ammo. It takes me only a few minutes to clean the firearm to ensure there will be no rust. Not an inconvenience for me. Also anything I've shot Barnaul ammo in shot it like surplus. I don't like paying extra for non corrosive if it's also just plinking ammo.
Last but not least, reloading. I have Lapua 7.54x53r brass which is the same as the RUssian spec 7.62x54r. I have some 174 grain SMK for 303 which is the right diameter. I have shot a reload with this and it functioned perfectly. No accuracy testing yet though. Eventually.