So you are building up a Winchester High Wall?
I am no expert on 1885s but I think there were some differences in action wall thickness on the high walls which may be a consideration when using an original action. (anybody know for sure?) The modern ones would be fine I would think.
I always wanted to replicate a Jeffery retailed highwall in 500 express but never got around to getting one done.

From the article Ripp linked above:

"His particular rifle will regulate flat nosed 480-grain solids at 2,200 fps and 500-grain Woodleighs at 2,150. (The rifle has 26 inch barrels.) He has shot both these species with both these options and cannot really tell the difference but I think he would if the 480s were only doing 2,150 as the literature said they should."

Gun writers are so silly...