Only factory I've bought was S&B eons ago.
Since then though I've acquired handed in ammo.
Sako, Norma, Remington, Winchester and Federal chiefly and they all work just fine.
Bullet wise for reloading I've loaded Speer, Hornady, Sierra and S&B.
It wasn't hard to make them work. Easy in a 222. Especially book max or over a bit.
I have some ppu bullets to try yet.