For this step it would be good to be outside or somewhere with good ventilation because of the powder that will come from sawing the shell. Now you will want to cut about 1" to 1 1/2" off the tip of the shell, but since the shells vary it is better to start small because you can always take off more if needed. The goal is to cut off the top so there is a hole about the size of a nickel, if it is any bigger it may be hard to play.

To do this simply use the saw and cut maybe 1/4 to 1/2 of the tip off and then use your ax or chisel to split the rest off. This can be risky to do because it might take to much of the shell off, so to be safe you can try to cut all the way through the shell.

After the tip is off there will be a spiral like shaft in the middle. Use the flathead or phillips and the hammer to knock the piece out.