Hodgdon lists H4895 for the 375 H&H. You could use their reduced recoil load recipe.
H4895 powder was chosen because it is the slowest burning propellant that ignites uniformly in reduced charges. For years
H4895 has been the top choice of cast bullet shooters. For this type of shooting, loads are reduced even more than the
hunting loads listed here. To create this type of target and plinking loads, we recommend our 60% rule with H4895: Refer
to our latest reloading manual or the Reloading Data Center found on this website; take the maximum H4895 charge listed
for any given cartridge and multiply it by 60%. The shooter can create a 1500 to 2100 f/s load, depending on the bullet
weight shown. This works ONLY where H4895 is listed. DO NOT use H4895 in a cartridge where it has not been shown.
