I have read about this first in John Ross’ Unintended Consequences and then heard from “old shooters” about it.
It was a less Politically Correct age and certainly they still managed to shot safe…and just about anything they could lay their hands on back then. It is a long video so it is worth watching it with the beverage of your choice and do watch it till the end so you can freak out at the prize tables (Yes, plural) with $100,000 worth of guns back then.