When did a 9.3 become a Big Bore?
Just a guess.....when it's use is sanctioned by many African countries for dangerous game
Yep.
It is bigger than a 35 Whelen and is used with aplomb for Ele and Cape buff... sounds like a big bore to me.
As to the OP inquiry, to begin with WELCOME to 24hourcampfire! And it sounds like you have a REALLY excellent big bore rifle there. You might want to look or inquire here in the big game reloading forum but if it were my rife I would simply load some 250 or 286gr Barnes triple shocks ahead of about any medium burning rate powder you have available and call it good.
Good luck and good hunting.
