Another option is the Cutting Edge Raptor, 235 gr.which can be pushed at 3K out of a .375 H&H. It's a mono with six blades that frag on impact, the core boring on thru. I've heard that some PH's like them, not sure about on leopards. I've shot some amazing groups with my M-70 .375 H&H, no blood yet.

https://cuttingedgebullets.com/375-235gr-er-extended-range-raptor

Expensive, but compared to the cost of a hunt, not an issue IMO.

I do have Raptor experience, but with a .308. Check out this link and the review I submitted. See how that bullet fragged the hog's spine which was not in the direct line of flight. Chest shot hogs usually run, this one was DRT. https://cuttingedgebullets.com/308-135gr-er-extended-range-raptor The 235 .375 Raptor group was about that good. They are accurate. Both of these bullets are ER, good for long range. The .375 version should be good for PG.

DF