Staying with the Bent's fort theme from last week, here is a list of goods purchased by Bent, St. Vrain and Co. from the American Fur Company in 1839:

7 1/2 pounds seed beads
24 swords
2,000 needles
100 dozen cast steel butcher knives
150 sheet iron kettles (1 and 2 gallon)
2,000 English percussion caps
15,000 German percussion caps
5,000 "common" percussion caps
5,000 "best ribbed" percussion caps
4,500 gun flints
Jack knives
Manila and hemp rope
2 rifles with percussion locks
4 cast iron kettles

Of particular note in this list are the very small number of rifles, only 2. I would guess this means that Bent, St. Vrain were sourcing their rifles from somewhere else for the most part.
We also see percussion caps and gun flints in large quantities, showing both types of rifles were in use in 1839.
This is also one of the very few references to cast iron cookware during the "rendezvous" time period. Even if we see literal tons of it at reenactments.

Trading room in Bent's Fort, 2024:

This is a neat one, K.
I always wonder what kind of theft a place like that suffered.

The ratio of gun flints to percussion caps is an interesting data point. 27,000 caps give the same number of shots. A flint is usually good for 30 to 50 shots. Just using 30 shots/flint 4500 flints would give 135,000 shots, a five to one ratio in favor of flints. This suggests flintlocks were 5x more prevalent than percussion.

Great math, and I would believe that ratio. Percussion guns had only been out for a few years at that point. Plenty of flint guns still in circulation.

Hudson's Bay actually traded/sold flint NorthWest guns up into the 1870's, decades after percussion guns became available.