I am running a 6 Creedmoor right now. I have ran Lapua Creedmoor brass, though I'm currently in the process of testing alpha. I have 50 rounds to fire form on Monday. I found the Lapua brass didn't give me the ES that I was hoping for (Average ES of 19 i want it less than or equal to 10). The lapua is nice brass, though the Alpha is also some very impressive brass. You can't got wrong either way. Both are excellent choices. The Alpha brass is THICK.