Reduced Loads For .375H&H

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http://www.hodgdonreloading.com/data/rifle
Search for your calibre, in this case 375 H&H. Then select H4895 powder. There's loads available for 200, 235, 250 and 300 grains. Not exactly what the OP wants, but close enough.

As per Hodgdon's instructions (https://www.hodgdon.com/wp-content/uploads/2016/11/h4895-reduced-rifle-loads.pdf), you multiply the max load by 0.6 and you get the reduced load.
For example with 300grn:
max load = 65.0grn
reduced load = 65 *0.6 = 39grn.

My experience so far has been that 60% is a bit low, but works. From 70% or more, accuracy increases a lot.

I was trying to remember this formula as well. Didn't want to comment by putting out unsure numbers.

Remember, it doesn't make sense, but going too low in charge can cause really high pressure.

A lot of guys use reduced plinking/mouse fart loads, using cast or even pistol bullets. Chase some info from cast shooters or even cowboy action. I know jethunter was previously a business member here. Jetbullets I think.

Why buy a bunch of gear, when someone already produces a economical solution.