Have and have had and loaded for 9.3x72R and 9.3x62, never have loaded for or owned a 9.3x72R
That said, I have read that some early 9.3’s like the 9.3x72 had tighter barrels in the grooves? What we would consider undersized these days.
May want to check that before going all out on a bullet choice.
If nothing else the 9.3x72 would be a fine one for cast gas check bullets.
- Mike