I've been refering to what you call crimps as chokes, not that it matters I guess, as long as we all understand what it means. What do you call closures like the end of a shotgun shell?
Hmm, interesting. In my mind, the words "choke" and "nozzle" are synonymous, and mean any narrowing at the end of a tube. However, if I just say "choke" or "nozzle" I would be reffering to a pressing of clay with a hole in the middle.
When I refer to a crimp, I would mean any point (probably at the end of a tube) where the paper has been folded or otherwise bent in. If this had a hole in it (as in the rockets) then it's a crimped choke, although in my earlier post's I have just referred to it as a crimp. In future I will be sure to differentiate between a crimped choke and a crimped closure, unless someone has better terms for referring to these. That would make the closure at the end of a shotgun shell a crimp, but as of now, it's a crimped closure to me.
And since this a good place for these, I call unmilled BP "green powder," but this is not because of the colour (which is only very, very vaguely green) but "green" in the sense of "greenhorn" - new and unfinished. "Weak powder" makes sense too, but it's not as univerally understood as green powder.
Finally, I think of silver as being a bright, cold, blue-ish, white. Meal powder white stars are white, potassium perchlorate and aluminium is silver. I have got what I would call silver from some BP and aluminium hummers once, but aluminium in BP mixtures is almost always just bright white to me.
What does everyone else call these, or any other terms that are a bit debatable?
