In the 1930s Yakima Canutt one of the Great Stuntmen and Actors of the Old Black and White Westerns, told Duke that this was the way that the Old Timers would know when their Gun Belt was 1/2 Empty and to Go To The Other Side Of The Gun Belt for More Ammo.
As Duke was a into the History of the Old West He Started Doing this in His Films. And Hondo is Correct it is a 45-70 Cartridge. That Means a 45 Cal. Bullet with 70 Grains of Black Powder in the Cartridge.
Chilibill
