I've had excellent results from this mould in my 1895GG (no ports).
I've cast them from straight w/w, straight lead (Pb), and w/w with 3-4oz of lead free solder added to improve casting and heat treating properties.
I cast them from straight lead for a friends Sharps repro in .45/90. He actually gave me the mould in return for some bullets as my casting set up is elaborate and results are much better than his efforts.
I've loaded them with everything from 5gr of Bullseye to compressed charges of IMR4064 and RL15.
I get ~1,900fps from the Imr4064 load and if I ever go to Alaska again, it's riding in the back of my plane........
I size the "hard ones" to .459" with Lee sizer and then heat treat. After heat treating, I run them through the Lyman #450 at .459" and lube with SPG. Accuracy runs aobut 2" @ 100yds. They perforate deer splendidly. I typically don't use this load much as a 318gr RCBS FNGC is much more pleasant to shoot at same velocities and still completly penetrates anything that I've shot with it (several deer and hogs to ~300lbs) There is such a thing as "too much of a good thing"!!!.