I still maintain that practical machine guns were dependent on smokeless powder.
[EMAIL=“Poudre B - Wikipedia”]Poudre B - Wikipedia
I still maintain that practical machine guns were dependent on smokeless powder.
[EMAIL=“Poudre B - Wikipedia”]Poudre B - Wikipedia
Another reason for the slow adoption would have been logistics. There’s no point in having a fast-firing rifle if the existing supply system can’t keep up with manufacturing and moving the additional amounts of ammunition required.
Broadly, I agree with you, but there were successful black powder cartridge based “Mechanical Guns” (ie the Gatling and the Nordenfelt) which were more or less the same thing as a machine gun, but operated manually (by a crank or similar contrivance) rather than simply holding a trigger.