Blank ammunition is a very important tool for an armourer for many reasons. One of those reasons is in order for a weapon to function properly the ammunition must be spot on. The primers must be of the correct hardness, the powder must burn at the correct speed and the shape of the case must be correct. All of these must combine to make a perfect blank round.
It is for this reason that we use only factory blanks. This means that we do not load blanks ourselves, we buy them in from large manufacturers, this is more costly, but they are more reliable and they are safer.
This brings me to the second reason that we use only factory blanks. We have found that when blanks are crimped by hand they are a little inconsistent which can lead to the crimp splitting and flying out of the muzzle. This occurs a lot more when blanks are re-loaded, which must never occur, when a blank round is being used on a film set.
Below are some examples of blank rounds, dummy rounds and a live round.
Dummy rounds are used in film when a close up is needed and the rounds will be picked up by camera.
Live rounds must never be on a film set unless a parks ranger is in control of any animals (such as a crocodile or tiger), and then only under their guidance.