Have a look at this video then @
grandpamac at about 07 min 47 secs in.
https://www.youtube.com/watch?v=mvr5R14OCfg
It even made the hairs on the back of my neck go up......and yet the lucky bugger got away with it.
Just the way that he is hammering the rod to prime it is an indication that he has something seriously wrong. I would suggest that the primer pocket should have been reamed out first.I personally use a resin hammer and they seat with just the lightest of taps on the end of the rod.
That all said, I share your thoughts in terms of setting a primer off. Reading on forums from the states there is plenty of stories of primers being set off.....and yet is such a litigious country where the sue mentality is so prevalent it is hard to believe that Lee have been producing this tool for 60 years and are still manufacturing it if indeed it poses any real risk to the user.
I'm not in denial as to the risks but just trying to make a risk assessment with horror stories in forums on one hand balanced against a company that still manufactures the loader when one would expect if the stories were half true, they would have been sued out of existence.
I still use it with caution.....as I do a standard press.....but each must make their own assessment.
Cheers
Phil