Anyone developed any loads for the Woodleigh 350 PP and FMJ for the 375 H&H?

Yes. Do a search. Use "woodleigh 350". Bob Faucett's page from Barnes data oughta help.
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I have a .375 Wby and H414 / W 760 work well with 350-grain RN and PP Woodleighs, but I had bullets disappear into the case under magazine repeated recoil and THAT WAS BAD!!!!! With IMR 4831 I get a compressed load I can crimp. With H4831SC under the same conditions it was too hot a load.

I have found max H&H loads to be a good starting load for Wby loading (.375) so what you might max your load(s) at, starting at 10% lower and working up accordingly follows:

IMR 4831 up to 78 grains

W760 / H414 up to 73 grains

I loaded them last year and used them on buffalo. I was right in the 65.0 grains for the 350 wood solids with RL 15 & on the 350 Wood PP's I was around 67.0 RL 15. Loaded them both to 2350 FPS. Start low and work up.....FYI just looked at my notes.....This 20lbs of RL15 I was woking off of was a slow lot of RL15. My previous loads with a different Lot I was using about 2 to 3 grains less powder.....

Mac

Ditto
67gr RL15 for both gave me 2400fps ave. Very accurate and effective on buff as well as other critters. Both PP and solids shot to same POI. Note these were MAX used at about 105F.