I long ago stopped beating myself up trying to convince those who are determined to use dangerous practices. I'll advise best I can and that's it. There are cases of revolvers and flasks blowing up from direct loading. Published in both American Rifleman and Muzzle Blasts, and maybe others. If you are in an ml competition and use that method you will be told to stop or leave. I don't particularly care if someone injures themselves after a warning. It is innocent bystanders I am concerned about.
I have seen just too much with the "It ain't blowed up yet" crowd. They can't be educated and don't want to be.
This is my last input on this issue. If you do injure yourself, I hope you go to my son's hospital. He is an emergency physician and loves the money you bring in.