In my gun I settled on 24.5 grains of WC820 (AA#9), BBA brass at the trim length of 1.390", and WLP primers for the CPB 405wfngc. 25 grains of the same powder for the 370lfngc CPB. For a jacketed bullet load, I use 22.8 grains of the same powder for a Speer 400 grain Gold Dot.
The caveat in all this of course is that these loads were safe in MY gun. Please reduce and work up in yours. Also, not knowing you, and not knowing how much research you have done for this cartridge, be very careful in that there are recommended loads out there using reworked Winchester 45-70 brass at a trim length of 1.410" showing higher charges than you will find using manufactured 475 L brass.
