I like the show but, they need a weapons / history expert
In just the first three episodes they have had some glaring errors with firearms. The killing with the .4570 rifle. They were used mainly by the army and buffalo hunters..4570 was called the "Army Caliber" and they were also commonly called "Buffalo Guns" "Horse Killers" was not a common nick name. The .45 caliber pistol used in the faked suicide was grossly underestimated. Either a .45 Long Colt or .45 ACP round would have caused much more damage to a skull be it from a living person or a long dead body.
I mention this because both instances were integral to the plots of each episode.This Frequently happens in movies and television. In a cowboy / western themed show you should expect the characters to know firearms. At least more so than the action hero that never reloads, never misses or gets hurt.