Don Heath lion article with comments on 9.3-
https://www.norma.cc/sv/Jakt-Skytteliv/Om-Jakt/Jaga-pa-afrikanska-stappen/lion-hunting-techniques/

Don Heath Vid.
9.3 at end-
https://www.youtube.com/watch?v=jakKUkKTM6c

He was a proponent of the 9.3 and experienced with problem animal control.