I have had boxes of Lapua 308 that were ready to load. I have also had a box of 308 and 223 that needed sizing just due to the necks being slightly dinged, otherwise they were fine dimensionally.
The best, most consistent brass I have tried is Alpha brass. They come in a case that keeps each case in place individually, ensuring perfect necks and dimensions and can be used to hold the loaded rounds. I ended up measuring the oal, necks and shoulders on 200 pieces because I couldn't believe how consistent they were. All within 0.0005" on every area of measurement. All of them. They have also been producing the lowest SDs I have ever had.