What precisely is your point, there is such a thing as common law offences which are not laid down by statute but are still enforceable by law. I think if you pop round next door and strangle your neighbour you will be convicted of the common law crime of murder. Why not just make up a batch of ammo and flog it and you will no doubt find out directly from the judge precisely what offence you have committed. Much easier than asking questions on the internet and getting answers you don't like.