So it is NOT Cowboy Action BUT I thought it might be fun.
I was cruising through YouTube and I noticed the following vids from Desert Brutality two gun competition this year from the InRange channel. One of the guys is running a Winchester 1873 replica and a 1911. I found it somewhat interesting.
The Match runs with the 1873:
Day 1 https://www.youtube.com/watch?v=c23ViNFqi6k
Day 2 https://www.youtube.com/watch?v=Q-vv2OOLS7M
Intro and rundown of the 3 guys equipment in the vidshttps://www.youtube.com/watch?v=BgfpgZDEOno
They have several classes for the match. The three guys in these vids are running in different classes:
1946 and before Classic Manual, Classic Auto, 1947-1986 Retro Light, Retro Heavy, Scout, Armored +P,
Announcement of the meet:https://www.youtube.com/watch?v=_HGujhmqy6I
There are two vids each for the other members of the trio above as well as vids for some additional competitors including Finns running Aromored +P for the match a Q&A session and if you dig a little videos for the 2019 competition and I assume the Finnish competition they mention as well.
I did find it interesting with the RO/Ref giving encouragement and sometimes spotting for the competitors.