I use the Burris, Signature Z Rings (the ones with the inserts) on my 550. However, I also have to use the CZ weaver rail base.
After mounting everything up, the scope objective len's bell sits about 1 3/4" from the barrel (I'd have to measure it to get the exact distance, but there is a lot of room). The scope is a Burris Fullfield II, with 40 mm Objective Lens. I thought the height of the scope was going to be a problem at first, but the configuration actually gives me a better cheek weld and the ability to hold my head up straighter, and not have to crank my head over and squint into the scope. I like it. Now all I need is a scope with an objective lens of around 55 mm.