Quite a lot of violence and a high body count. I think it could easily be rated PG-13. Most of the shootings have little blood and are not graphic. A few, however, mostly toward the end of the film have some more blood. A man is shot in the very opening scene of the film (no blood).
Two people are hung. They stand in the back of a wagon and the wagon lurches forward. A close up of the woman's face is then shown after she is dead.
A woman arrives at a man's house and hands a man a handkerchief. The man unwraps the handkerchief and a man's ear rolls out and onto the ground. Brief.
A man is captured by a gang and a few scenes later is shown underneath circling buzzards, dead. He is tied spread eagles to a tree and a close up of the side of his head is then shown. He is missing his ear, and where is ear used to be is bloody and there is a hole there. This is probably one of the most graphic scenes of the movie. This could be disturbing for viewers.
A dog is hit with the butt of a rifle but he is later shown to be fine.
The end shootout lasts approximately 40 minutes. This is where the body count climbs. Countless men are shot, most with little blood and most in the stomach or chest.
A man walks outside of a cabin and is shot. He is pulled back inside and is later shot several more times. He is shown with blood on his mouth and running down his chin. He is also shown with some blood on his chest. He dies after talking for a while (eyes open). A man closes his eyes.
A man runs with sticks of dynamite. He is shot. He then stands up and has blood all over his face. He throws the dynamite and then falls, dead.
A man rides a horse while he is carrying lit dynamite. He is shot and falls from his horse. The dynamite explodes (presumably blowing the man up, but the man is not seen).
Two men near a cabin and are shot through a window at very close range. No gore.
A man is pistol whipped. Several people are punched.
A cabin is lit on fire. A sheep can be briefly seen with a bloody wound underneath its leg. It is said that it is from a wolf bite.