I doubt anyone has tried that. I wouldn't think its a good idea.
The Type 38 Arisaka was chambered for the 6.5mm Arisaka round (6.5x50mm)
So, first off, I don't think a .375 Ruger round will fit. Its too long. Specs say loaded length of the .375 Ruger is the same as loaded length of the .30-06 round, and I think that's just too long to fit in the Type 38 action which is made for a round with a loaded length of 2.940"
It MIGHT work for length with a Type 99 action the 7,7mm Jap is max length at 3.150". I don't know if there is enough extra room there to allow the 3.340" length of the .375 Ruger, but I'm sure the room isn't there in a Type 38 action.
Second point even if it did fit for length, you'd need bolt face and receiver rail work to fit and feed the significantly fatter Ruger round, and last point,
According to Wiki, the 6.5 Jap is a slightly under 43000psi round.
The .375 Ruger is listed at 62,000psi.
Putting a round in a rifle that generates a third more pressure than what the rifle was built for is generally thought of as a BAD IDEA.
For a .375 Ruger, you need (at least) a .30-06 length action, either with or adaptable to a magnum size bolt face, and able to take 62,000 psi loads.
The Type 38 Arisaka does NOT meet any of those requirements, Sorry.