I have a theory that Sasha Siemel's S&W .44 was a .44-40, to share ammo with his Winchester M-92 .44 carbine. And most S&W .44-40's did go to South America.

Anyone know how much .44 Special ammo was sold in Brazil from about 1917-1960? But .44 Winchesters were pretty common and are still copied there by Rossi.

Siemel may have had several .44 S&W revolvers, in both calibers.