I live in Castle Rock but work in Aurora. I have 3 boxes of Hornaday 62 grain  .556 loaded to military spec I would like to trade for some .300 Blackout .

would trade an unopened 150 round box of .556 for 100 rounds of .300aac depending on what you have. If it's Wolf steel case obviously it would be closer to 1 for 1. I'm interested in both supers and subsonic. 

You can text me at REDACTED or message me. I would also sell this ammo for $100 for 150 round box.