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.

 

[Choupique]

Trail boss !!!!!!!!!

That's all I've tried in mine so far (so fun with 200gr bullets), but I will be trying h4350, RL17 and IMR4895 come spring time.

 

[BlaserNut]

People I know around here, H4895 has been the most recommended to me followed by H4350, I'll likely default to one of those. Does anyone have experience with Norma203B?

Thank you everyone for your insight.

 

[Chupacabra]

H4350 and Nosler AB 260s is my recipe. I’ve shot the old school Hornady all copper (cx I think) and it didn’t group as well. This was through a Ruger #1 tropical. I will see if I can find my notes on speed. I wasn’t pushing them super hot though.

 

[pbroski]

H414/W760 has always worked well for me with 250 to 300gr bullets