Part of the problem is people referring to smokeless powder as an explosive. It burns, rather than explodes. Different powder burns at different rates, that is why you have so many different kinds of smokeless powder. Why do you think that you have to record the purchases of smokeless powder? Could it be because it can be a hazard by suddenly exploding? Not likely, you can drop a container of smokeless powder on the ground, and it isn't going to explode. If you throw a handful of smokeless powder into an open fire, it will burn , but it won't suddenly explode. Is it because it can be used to make a bomb to explode something? Not really, because it makes for a poor bomb. Could it be because you can make ammunition with smokeless powder, not likely, because you can buy ammunition simply by showing a PAL, and your personal data isn't recorded. In actuality gasoline is much more dangerous, and you don't have to supply your name or address to purchase gasoline. So what legitimate purpose could their be for recording all purchases of smokeless powder?