For Leopard and Lion with my 9.3mm I would use 258grn RWS H Mantle's and 286GRN Woodleigh round nose soft's.
If I were to use my 7x64 for Leopard, I would use ether 162grn RWS TIG or 174grn RWS H Mantels.
Purely because I have found these bullets and rounds open up and kill well on Leopard weight game, but without creating too much damage.
If I was to use a 300Mag, I would be happy to use 180grn Swift A Frame's or Woodleigh Protected Point Soft's.
Ps,9.3mm, 286grn Woodleigh RNS worked well on my Lion.