+1 on using the Barnaul since it's still
available. If you can still find some
Chinese, it's decent as well. I found the Yugo ammo to be very accurate,
but it's also corrosive. The East German is no more accurate than Wolf
and it is VERY corrosive and will rust everything back to the bolt carrier
within a day. You'll still see the East German from time to time at shows
in 10 rd clear plastic packs --avoid this stuff.
Romanian Match is very accurate, but harder to find than hens teeth.
Original Czech mil ammo is also very accurate --moreso than the S&B
civie version. FNM and PMC were both decent, but it's been a long time
since I've shot either.
+1 on the US made ammo being of mediocre accuracy despite the price.
However, it is the only brass you can reload and once you throw some
consistent powder in your handloads (which the factory does not), you'll
be very happy with what you can do. BTW, some rich guy left some
once fired RP brass laying around the range last week which I was more
than happy to give a new home