I do think it’s looks.International ML competition rules ban blowing down muzzles between shots , I feel that something must have happened sometime, somewhere to get the practice banned , but I have no idea who, when or where .
We have all heard the urban legend about the guy who blew his brains out at a shoot. In various telling she does this in-front of his wife, or young son or daughter, or a class on field trip
It’s bunk
Heard from a friend who new a guy who went to school with the guy who saw it.
However it violates every rule of breechloaders, and servers no purpose. So as a matter of optics it’s outlawed