to be honest, I've bought around 1k rounds, I'm probably going to just shoot what I have and reload the cases. Boise gun does sell 5.7 when they have it in, but the vast majority of mine has been from Impact, as they are the closest to my house. For a while I was trying to buy one box every paycheck. Right now I'm in the market for a 10/22, as 22lr is about the only thing I can afford to shoot.