For the CHARON helicopter project I wanted to build a 7-shot rocket pod, similar to the US Hydra System
For this I needed Rockets (or at least the warheads).
So I cut a 1.5cm long piece of plasticrod (in the diameter you desire your rocket to be) and mounted it in the electric drill.
Then I slowly ran it first over a rasp and afterwards over a pad with sandpaper.
With this I had 7 rocket warheads in a minute. For more detailing I also added a small rim - holding a knife over the plasticrod, while it turned in the drill.