subfan,
I used to own a 7600. I was never adventurous enough to remove the barrel. I cannot remember being able to remove the bolt from the rifle without performing disassembly I was unwilling to attempt. Remington will send you a user's manual, as the manual is also responsible for providing safety information, it twill be free and will detail how to disassemble the rifle for cleaning . Careful cleaning rod guidance as the bore is cleaned will prevent any damage. There used to be bore guides available for use from the muzzle.