I saw that too, interesting to say the least.
But keep in mind, it's still Hollywood. I know a gent that was an advisor when they did one on the "Mountain Man". Several times when he pointed out an inconsistancy in the filming he was told it's for entertainment.
But it sure does lead you to respect the guns they use. What I found interesting is all that info/equipment is available to the civilian market, albeit premium $, except the "prioritized" powder the use.