I learned this the hard way while making the revolver, but although I have the know-how, the difference between theory and practice is like heaven and earth.
Problem number two: the cartridges.
Rifle cartridges are very different in appearance and contents to handgun cartridges.
First, the outer shape of the cartridges is long and narrow, with a neck like a wine bottle along the way.
The powder inside the rifle bullets burn slower than that of handguns (although only by some 1000ths of a second).
Because the combustion speed is slower, the pressure in the airtight compartment inside the case and barrel increases, so it can fire bullets at a higher velocity and energy.
To reproduce such a powder, it is necessary to do extraordinary experiments.