A buddy of mine (many decades ago) picked up an ancient .38 rimfire and a box of BP ammo for it. Lotsa fun, but only like 80% of them fired the first time. About half of the duds fired the second time around after rotating them in the chambers. Apparently fulminate-primed.
Lotsa fun, lotsa smoke, dead ones revealed flinching (probably because we half expected the thing to blow up on each shot) and my gawd, the smell!
Like all of the belches and farts of all the demons of hell all at once.
Terry, 230RN