I shoot PPU in 7.62x54R, 30-06, 308, 7mm Mauser, 30-30, and 9x18 Mak. I've yet to have any issue with any and I reload for all of those, along with 8mm Mauser. I buy new PPU brass for 8mm. It isn't Lapua or norma brass, but it's as good as, if not better than, most of the Big 3 brass I've used. I have some 223 from PPU, but I haven't shot or reloaded it yet.
As for accuracy of the factory ammo, it's pretty good. I have one rifle in 7mm Mauser that absolutely loves the 139 gr SP. Most of the rifle ammo is about 2 MOA from most of my scoped rifles that usually shoot 1 MOA with my handloads. Keep in mind that, with the exception of 30-30 and 308, these are well used milsurp rifles. 7.62x54R shoots much better than Russian or Bulgarian surplus that I've shot but that's not any great revelation.
Matt