Re: Explaining Headspace
There are NO STUPID questions but..... this is the reloading forum and it is assumed that people who come here care about reloading. Such people should read their reloading manuals. All the above info is in the reloading manuals introductory chapters. I urge all to read their manuals, and re-read them until they thoroughly understand at least the terms if not the process and the "why's" of those processes. The stickies above also are a good introduction if you at least understand some of the terms.
Those who come here to discuss commercial ammo (and that is just fine) might gain something by buying an reloading manual to get a better understanding of even commercially made ammo. I recommend the Hornady manual as it is very good at explaining the "how it works" of ammunition.
An informed reloader/shooter is at the first step of safety for reloading and shooting.