I used 19.0 grs. of 4198 with an RCBS CSA 300 mold.

I think I might try loading smokeless in this rifle.  I am trying to get a handle on the original black powder ballistics were for the cartridge.  This time Wiki is no help. Doing a little searching and I found one reference to an original factory load using a 265 grain bullet at 1400 fps.
   The vintage Winchester mold I have with its handle stamped 40-82 produces just that very bullet a 265gn fn-pb.
   The only comparable cartridge I can think of for load data is the 401 WSL at 1.5" case length. The 401 works at a way higher pressure than I would ever want to put through a BP roller so no real help there.  No doubt I will figure something out but I would like to be sure that 1400 fps with a 265gn bullet what I should be looking to duplicate with a smokeless load.  Was that the original BP velocity and bullet weight ?