Shows as in stock for me.
Received mine last week. 2 boxes came from Texas and 1 came from Florida. The brass and bullets are Barnes!
It's UMC 120 gr OTFB. Must be made by Barnes for Remington.
http://www.southwestammunition.com/product_p/300blk147gb.htm
300 BLK 147 grain FMJ: 250 round Group Buy
Our Price: $154.95
Product Description: Our 300 Blackout, 147 grain Full Metal Jacket round is NON-MAGNETIC (indoor range approved), and is now available at the all-time low price of $0.61/round! We load these with FC brass, never fired, that has been formed to 300 BLK. For a limited time, we are selling them bulk packed, 250 rounds per group buy! We only have enough components for 20 Group Buys, so order now while supplies last!
-300 Blackout 147 grain Full Metal Jacket
-1950 fps from a 16" barrel
-G1 BC: 0.415
-50 Round Box
-NON-MAGNETIC
-Ships within 2-3 weeks; however, shipping may be delayed if you add other ammo to Group Buy order.