As I reported a few months ago Amazon was selling ammonium nitrate. I ordered some and last weekend I finally got around to testing it in reactive targets. I didn’t do any low velocity tests but it worked fine from 30 yards away with .223 ammunition.
I don’t know what the “new regulations” or if they have gone into effect or not. But Amazon is still selling AN at a price people wanting to make their own reactive targets can afford. And if Amazon stops selling it there is still Ammonium Nitrate For Sale which also has exploding target mix.