The film set looks to depict a western style movie....a John Wayne if you will. If this is correct, then they would be using revolvers or wheel guns. You should be able to see the projectiles in the cylinder with the exception of the one round thats facing down the barrel. Once the trigger is pulled, that round thats not visible would rotate to the right and not fire until it comes around again. So if they were all blanks and clearly visible as such, why the one shot one kill? Did Baldwin not check or was he told they were all blanks?