Check out these deals on 8mm ammo for your Yugoslavian 8mm Mauser. This is Match Grade ammo from Yugoslavia.
Match grade means that the tolerances for their target ammunition are greater than for their sporting ammunition. Flash holes de-burred, brass tolerances are higher, bullets weighed and powder measured under stricter criteria.
8mm Match ammo will not help your Mauser shoot sub-MOA if you cannot shoot, but if you want to take that extra step to tighten your groups and do not have time to re-load your own ammunition, this may be an alternative.