I see a lot of potential here! But that is me a dreamer always.

You could have the barrel re-bored & re-chambered to 9.3X62. Since you already have one of those, how about a Rigby 350 Mag (who has the reamer?).

If it was my gun I would look at ... let me see...
A 338-06 would not be a silly option unless I can find a 318WR reamer!
I might still want to get it bored to 338 rather than 330.

Good luck Bob.