Here is another exceptional book if you ate interested in the Santa Fe trail.
https://www.amazon.com/Adventures-Santa-Fe-Trade-1844-1847/dp/0803297726And Webb, unlike Gregg, died of old age back east.
Another Classic read is
https://www.amazon.com/Wah-yah-Taos-Trail-Rancheros/dp/1429045523this book like Gregg’s Commerce of the Prairie is an old standby!!!
While on Gregg, his last trip to Santa Fe he and his brother both had a pair of Patterson Colts and a Patterson revolving rifle, which gave the pair 36 consecutive shots!!! ( The revolving rifle were 8 shots apiece!).
Upon his return to St. Louis he doesn't mention the Pattersons again. He did loan his brother his two revolvers when they were about 60 miles out of Santa Fe as he went in early with two of the New Mexicans. Im sure they were sold for beaucoup gold. He does mention that he did carry a Cochran turret rifle on the way back that he finally managed to kill a buffalo with! I believe they were like .36-.40 calibre.