Can you turn the nitpick back on and explain the difference to those of us who openly admit we know NOTHING about bullets, but would LIKE to be ACCURATE when we describe our products!!!
Gladly!!!
I'll limit my description to "centerfire metallic rifle cartridges". That is, I'm not talking about every kind of ammunition, just the ones typically made into replica pens. I don't want to get sidetracked into rimfire, shotshell, antique, exotic, or otherwise atypical ammo discussions.
The technical name for a complete round of ammunition (what you buy in a box and load into a rifle), sometimes called a "shell", is "cartridge". A live cartridge is composed of 4 parts:
1) The "bullet", which is the actual projectile. This is the part that shoots out the barrel of the rifle. These are typically made of lead, copper-jacketed lead, or solid copper. Some also have steel or tungsten cores and some have tracer material in the base.
2) The "case", sometimes also called "shellcase", and commonly referred to as "brass" (although nickel-plated brass and steel cases are common too). This is the other primarily visible portion of the cartridge. For many calibers, it is shaped like a soda bottle (although others are straight-walled), giving rise to the term "bottle-neck case". Many people call this part the "casing", which is a misnomer. "Casing" is what you stuff to make sausage. Language, however, is what we speak - not what people tell us we should speak - and it is constantly evolving. Maybe this term will change.
3) The primer, which is the piece that ignites when struck by a firing pin.
4) The powder, (technically the "propellant"), which burns rapidly under pressure, creating the expanding gas that propells the bullet.
We don't generally use the primer or powder in pens (although we sometimes leave a spent primer or empty primer cup in for decoration). Generally our pens use either the case and a kit nib, or the case and drilled-out bullet nib. I call the first a "rifle case pen", and the second a "rifle cartridge pen". Strictly speaking, this isn't a complete cartridge, but I don't know of any better term to use.
There is additional terminology describing shapes and parts of bullets, cases, powder, and primers. Do you want that info too, or has this been enough?
Regards,
Eric
P.S.
Hmmm, perhaps I could use the powder in a pen after all. Now I'm thinking about casting powder and putting that in a cut case or window case pen.