Hello Wayne t,
One of my friends (Jeff Loffert) has used the 9.3x74R with 286 gr Nosler Partition, in Africa for two safaris (springbok through eland).
One trip he used a Ruger #1 with 4x Zeiss scope.
One trip he used a Simpson drilling with I believe also a 4x Zeiss.
He sings only happy songs about this cartridge and specific bullet.
I watched him shoot a springbok in open grassy conditions, a waterbuck via a long poke across a canyon and a zebra in thick bush with the Ruger / Nosler combination.
Likewise I watched a video of him bagging a bull eland with one shot from the 9.3 barrel of his drilling / same bullet, the huge bull tipped over fast.
It was all very decisive and impressive results, yet with minimal damage to the little springbok.
I've only used the Nosler Partition in .300 H&H for one safari (180 gr), plus hunting in my home state of Alaska.
So, I probably shouldn't vote on the 9.3 version.
However, I will anyway, hahaaa.
And I'd say it is an excellent choice for your 9.3x74R.
I believe as long as you do not choose one that is too small in caliber / too light for the velocity your rifle produces and for the size of game hunted, the old Partition is one of the very best bullets for so called "plains game".
It is one of my favorite hunting bullets of all time (and I'm a fossil, so I've seen a few things).
Likewise, I will guess it'd be excellent for lion / leopard (sure plays a treat on Alaskan bear and moose in calibers like .30-06, .338 and .375).
I agree with Shootist43, that this bullet was actually designed for the front end to almost explode, leaving in effect, a "solid with sharp jagged edges" to continue deeply through meat, tendon and bone.
That being said, it is definitely not a bullet I would choose for buffalo.
I believe the Swift A-Frame, backed up by flat nosed solids are what I would use for those, this day and age.
Cheers,
Velo Dog.