LMAO, I'm not an expert but I know that I don't want anything big or hot in something that small. Hopefully Mr Vella or DarylS, real `smiths will add to this.
The 38-55's I have are in Ballard single shots, one of the weaker actions of that era. I would not load it to the pressures of the 375 Winnie even though the cases are very close to the same.