I recently finished building my 300 AAC Blackout and when I ordered it I purchased 250 rounds of ammo from Ozark Ordnance. When it finally arrived I proceeded to happily load mags and I went to chamber a round and it jammed in the breach. The bolt wouldn't close and I had to dismantle my rifle and pry the round out "Ok just one bad round". NOPE! every damn round I tried did the same thing. So I bought a very expensive (comparatively) Remington box and they chambered and cycled just fine. Tried my friends Hornady, same thing. Chambered and cycled just fine. I have tried to contact Ozark in 2 emails and 3 calls to no avail. The casing necks are too large and all 250 rounds are most likely the same as the 6 I have tried so far.