The 44 American is very close to the 44 Russian.
I just gave away some .44 Russian and .44 American brass. The latter is .10" longer than the former, and .10" shorter than .44Spl brass.
Member: Orange Gunsite Family, NRA--Life, Varmint Hunters' Assn., ARTCA, American Legion, & South Cuyahoga Sportsmen's Assn.
Caveat Emptor: Cavery Grips from Clayton, NC. He is a ripoff