GREAT NEWS! Looks like there is a new 5.7 ammo player in the game.
New CBC Ammo - The Firearm Blog
I have been using their new 300BLK 124gr Supersonic ammo. It is $9.99 for a box of 20 and it is great range ammo! Much cheaper than anything else out there in Supersonic 300BLK. It hits to virtually the same POI as my defensive load, the Barnes 110gr Vortex, and my usual target load the Remington UMC 120gr. I shot a few hundred rounds of the S&B 300BLK 124gr this weekend, and was very happy!
Can't wait to try thier new 5.7 ammo! I'm sure it will be very reasonably priced as well.