If you read the ad, it tells you the powder is WPT105 which is USA made by General Dynamics, the case is made by Aguila like Justin said, I also think he is correct that it is made, primed, and assembled by Aguila.
Some of their stuff shoots fair, I use some of their pistol match, and Super Extra for practicing positional shooting, at 25 and 50 yards. The accuracy falls off beyond that too bad to shoot it further than that.
I have been paying $25 per brick of 500, there is a pawn shop not far from me that has kept it in stock even during the ammo shortage. Limit 2 bricks at a time. So I have bought 6 bricks up to a few weeks ago.