Most Historically Accurate Westerns According to Famous People

For those of us who love westerns, we're quick to notice if a Western film isn't accurate, whether it be the guns, costumes, or props.
There are several Westerns that made the effort when it came to maintaining historical accuracy. It's important to note that no western is 100% accurate. Perhaps they get the historic details of the event correct but get some clothing wrong or guns used. We are looking here about those who make the best effort of getting it right. Remember, these movies are fictional accounts of history but not documentaries.