This is my Rammus jungle build I've had my best and worst games with this build but I usually don't stray from it. I put this together for a friend but I hope everyone gets good use out of it.

This is my basic runes setup for Rammus. It stays the same if I'm laning.

This is a masteries setup I've seen other places, it works better for me than the one I was using but I do have multiple pages for jungle Rammus. You can move the 5 from offense to utility picking up Summoners Insight,Mastermind and Runic Affinity which is the preferred jungle setup which i do also use, but i wanted to give you another less used one that I like.

These are the items I like using with jungle Rammus. Notes with them.
Will add more information later.

This is the basic sequence you will find in most builds.