They often have more powder than a live round too.
When filming The Crow, a dummy bullet without powder or a real primer was loaded into a revolver for a shot and nobody realized the bullet fell out of the fake round into the barrel. So when the same revolver had blanks loaded into it in a later shot, the overcharged blank propelled the bullet from the barrel, killing star Brandon Lee.
They often have more powder than a live round too.
When filming The Crow, a dummy bullet without powder or a real primer was loaded into a revolver for a shot and nobody realized the bullet fell out of the fake round into the barrel. So when the same revolver had blanks loaded into it in a later shot, the overcharged blank propelled the bullet from the barrel, killing star Brandon Lee.