Learn something new every day you have to excuse me I retired and raise ac10vyear old grand child that's why I talk so much and I was a salesman alaoYes, that's exactly why I'm reloading with black powder, not with smokeless.
The "Trapdoor-safe" or aka "Cowbody rounds" of 45-70 are smokeless powder downloaded to produce a muzzle velocity and chamber pressure equivalent to an original full load of 70 grains of black powder. 65 grains is the max I can load with the flat-bottom bullets I can get. The original bullets had a hollow base, which I presume is how they were able to pack in 70 grains.