Yes, but it doesn’t have to be packed precisely like a primer and you don’t have to worry about each little anvil being in the right place. Chlorate primers are corrosive too. The tolerances for cartridges to operates consistently are a lot tighter, plus it would be very time consuming to produce enough by hand. If it were to come to not having any primers available, I imagine by then there wouldn’t be any smokeless propellant either. We’d end up going back to manufacturing our own black powder like mentioned earlier.
Smokeless propellant isn’t difficult to make.
Making a particular burning rate of smokeless propellant.... well, that takes some work.
But making something like gun cotton and then molding it - not that difficult.
It all seems like a huge problem to people who are liberal arts majors, who know nothing about manufacturing or machining... but there are enough of us out here who read poetry only as a hobby because we knew it would never pencil out a family budget. The barrier to making one’s own powder and primers is not as high as some would believe.