On this forum, one of those is called a "Fatty", and yes, you can use different meats, though most use pork sausage. If using beef, I would cook it to whatever temperature would cook it to well done (140? I never intentionally cook beef to well done, so am not sure, but that sounds about right).
I used 3 oz. of Hickory last time I made one.
They are fun and impressive and relatively easy to make, but I did find that they don't last very long, so make more than you think you will need. Get creative with the fillings, and Enjoy!