Rem 700 Barrel Removal

[mosigdude]

There seems to be a broad range of knowledge on here, so I'll start with the question here.

Does anyone know, if I remove a barrel from a Remington 700 and then later reinstall the same barrel on the same action, is it still necessary to re-fit and re-ream the chamber to headspace it, or will this happen automatically if I re-use all the same parts?

I'm looking for a way to turn and thread the muzzle for a muzzle break and maybe someday (if we ever get legal in MO) a suppressor. I have the lathe and machining skills to do the threads, I just don't exactly know the in's and out's of the 700.

Any procedural / special tool advise would be appreciated.