The US never used cordite as a military powder. It was examined and tested, along with German Ballistite and French Poudre B.
All three were rejected for various reasons and the US military turned to both military and commercial research sources to develop the first smokeless powders in America.
"The gift which I am sending you is called a dog, and is in fact the most precious and valuable possession of mankind" -Theodorus Gaza
Baby Jesus cries when the fat redneck doesn't have military-grade firepower.