I was shooting with a regular in our group. We rotate on occasion or need.
Wealthy older guy.

He said he liquidated 142 guns at the top of the market 2012-18 out of his collection and has simplified because of his age.

He mentioned a few, but not all SO5s, high value 21s (sold one for 42k) and some double rifles.

His estimation is the market is dead, never to come back.

"All the collectors such as himself have died or lost interest"

It was clear his kids and Grandkids did not want any.