Theory about the ammo thieves.
So when Carver and his one remaining hired gun stay with the "religious people" it seemed to me they were not really religious. The main guy had a rope burn on his neck (survived a hanging?) and he said he got it because of Mormons. Were Mormons back then hanging opposing religious leaders? That made no sense. Anyway, they also had booze and played secular music ("not hymns") and stole their ammo. The next day the two come upon a broken wagon, a broken organ, misc. refuse and a bible on the ground. I think maybe the 'religious people' were a band of western "gypsies", came upon some real Mormon settlers, got rid of them and took over their identities. Just a detail of this movie I had not read here yet.
Cheers!