What is the best powder for the .375 H&H?

[BlaserNut]

I've been shooting a Blaser 93 .375 H&H with 260 gr Nosler Accubonds loaded with 72 grains of RL-15 powder. My shots keyhole at 200 yds, so I've never wanted to mix anything up. Now that I can't get RL-15 I'm looking for a new powder. Does anyone have experience with large magnum bullets, good or bad, that can help point me in the right direction?

 

[06 SB]

Back when I shot a 375H&H, I used H4350 with a 260gr Nosler Partition and I4895 with a 235gr Barnes TSX.

 

[Edge]

Using H4895 in 250 TTSX but that’s another powder that’s become scarce. Using RL15 in my 300gr loads but I’ve set aside 3 or 4 pounds to hopefully get through this dry spell and can restock.

Hodgdon lists both H & I 4350s in the 260gr load data and available but no first hand experience.