There’s a member on THR named slamfire who is passionate about this topic. He has compiled a list of reports of slam fires which are primarily in garands and AR15s in high power competitions. A large percent of the incidents mention cci400.
The link below has some of his commentary about the debate over the past 6 decades along with his list which is not a particularly quick read.

https://www.thehighroad.org/index.ph...#post-11153988