The shell is now finished. It is a good idea to attach label in case you keep the shell over a longer time, so you will know what type of shell it is, which stars, amount of lift etc.
The shell can now be fired, but please note that this is obiously the most dangerous part of it all, so proper safety gear must be used. First of all your eyes, fingers and ears are the most important thing to protect. Wear safety goggles/face shield, fireproof gloves and ear plugs/earmuffs during firing (as a minimum!)
When firing, you can either use a mortar stand to hold your mortar tube if you have one, or you can bury the mortar tube in the ground about 2/3. Next the shell is loaded to the tube with the quick match or shooting wire sticking out - the shell should fall freely, without any help to make it reach the bottom. Also please take care of your surroundings: The shell should be fired a long distance away from people, houses and flammable objects. Run a good long distance after igniting the fuse. If you want to film the shell, it is recommended to be at least two persons: one will be filming, the other will ignite the fuse.
If the shell should somehow fail to lift properly and explode on the ground, you will be glad you did wear safety gear. Sometimes a "flower pot" happens (mainly if the shell is not sealed well around the time fuse, or if the spolette is not rammed solid enough), which is simply the shell explodes in the mortar, shooting stars into the sky. The mortar may or may not fracture when this happens, but this is where burying the mortar comes in handy: the surroundings of the mortar will arbsorb most of the shock, and the fragments may not fly very far.
The shell was fired in front of a small audience (consisting of my family) I excuse the annoying voices/laughs/whatever.
Hope you enjoyed this instructable, which is my first one. To find out more about pyrotechnics go to: PyroGuide.com