I liked parts of the final gunfight in Open Range (notice, I said parts of). The firing of too many bullets out of one gun before reloading for example , wasn't one of them. When interviewed, Costner said that he was filmed drawing the second gun but, it got lost in the editing. The rifle part of the shootout was good.
Just as an aside: The glacier shown in the opening credits and later in the movie, The Far Country, is a lot smaller now than when the movie was made.
Also, a real life movie spoiler, The NWMP police were in full force in the Yukon before the onslaught of the miners, with the famous Sam Steele in charge of the Mounties and James M. Walsh (former NWMP of Sitting Bull and the Sioux escaping to Canada fame) was Commissioner of the Yukon at the time. There were 96 NWMP members in the district in 1997 and by 1998 there were 288 NWMP in the area. The Yukon Field Force, taken from the Permanent Canadian Militia, consisting of 203 officers and men served in the Yukon from 1898 to 1900 to assist the NWMP. The reason for such a huge military and police presence was the fear that the U.S. might attempt to seize the region. When those fears subsided, the Field Force was reduced in size and were totally withdrawn in June of 1900.