Today I pulled out the chronograph to see what this .38-50 pushes these 357 gr bullets. I just shot here on my 100 yard range that has been shooting the best on the 200 yard range with a couple different types of powder and loads.
All the bullets were case with my alloy I use that is a 1# roll of 95/5 no lead solder 18# lead except for the 5 rounds using Arnies WW/Linotype alloy. For some reason I got one round loaded in a 303 British case that got mixed in with the .30-40m Krag cases. The .303 Brit cases are .039" shorter. I would not have thought that they would slow the bullet down about 20 fps, but it did.
Those 5 shots using Arnies alloy measures .721" outside to outside spread. I could not get a good center/center measurement.
That WW/Lino alloy drops a lighter and very hard bullet compared to what I use. I think I will cast a bunch more using that stuff.
I have several loads of 1.5 Swiss and 2F OE I did not shoot today because my fingers got so cold. It was 35º this morning and now it's 45º. Should have waited till it warmed up.

The 64 gr load of 1.5 Swiss and 65 gr of 2F OE and Swiss has shot the best at 200 ladder loads.
I'm very happy sofar how this .38-50 Hepburn is shooting.