I have a 500 express that I am restoring. It is from the tail end of the black powder era, so while it is stamped 'NE' I think I'd be more comfortable with lighter pressures. The 500 nitro express and 500 Black Powder express cartridges are not interchangeable loads even though the projectiles and brass are identical. But load data from either would be helpful. I'll be loading a cast lead bullet of about 350 grains. Proof load stamped on it is 136 grains of black powder with a 340 grain bullet. I'm looking for a smokeless powder load on the light side of that to work up from.
Anybody have any suggestions?