Not sure exactly, but with heavier bullets in the 250-275 weight range I used RL22 and similar for the top speeds, I’d kinda think you’ll be using faster powders in the 375 version with the same bullets. It’s quite a lot different in diameter. Kinda like the 06 and 35 Whelen. There is some crossover but not a ton.
Maybe check case capacity and see where you sit compared to the 375 H&H and Ruger cases and extrapolate data from there.
I’d think minimum H&H loads would be a place to safely start and you can adjust from there as needed.
Thank you for the advice.
Had a .375-338. 4064, Varget and RL-15 are what you want to use.
You don't want to use .338 WM data - it's a very different expansion ratio
I know those are the ideal powders, and I'd like to use them, but I went to 4 gun shops last week and reloading components were pretty empty and grim. I'm hoping to find something that will work until (hopefully) things get better again.
I’d think minimum H&H loads would be a place to safely start and you can adjust from there as needed.
That's what I did with mine. No troubles. Mine liked Varget.
Thanks for the help Paul, I appreciate it.
Cory
