I have one in 416 Rigby and love it. It has cross bolts and has shot great and functioned flawlessly since day one. Only complaint I have is the bolt handle rides pretty close to the stock on my rifle and is a little hard to get a grasp on it.
I illustrated this with description and photos in my article about modifying these CZ550 rifles for dangerous game that was published in African hunter Magazine a few years back. One of the modifications I did and highly reccomend was to have a competent gunsmight who has access to a good heat sink etc and understands the right way to bend a bolt handle without changing the hardness and maelability of the overall work and steel bend this bolt handle outwards about 1/2 inch. This inexpensive and relatively monor change allows for one's hand to easily strike the bolt handle knob on its fast upstroke motion without missing it.
Other modifications to my CZ 550 include Weisner drop box bottome metal, Ed La Pour 3 position Model 70 syle safety, beefier crossbolts in the main body of the stock, a bolt through the pistol grip area glued in with Brownells Steel Bed, and full length bedding throughout. I also had a more robust simpler NECG trigger with a model 70 trigger pad welded to it added to my rifle and an overall polishing and tuning up of the feeding and slickness of the action.
Right now the stock is in the hands of our very own KARNIS who has re shaped and re finished the stock beautifully (As he always does) and is bing checkered by an associate of his. I am anxious to get it back in my hands with its newly re shaped handle! These stocks are, IMO, a bit piggish in overall shape but are good functional handles as issued.
My modifications are addmitedly more than what a casual and occasional hunter would neeed to do but I started this project when I was spending a lot of time in Africa helping my PH friends to conduct hunts that I had booked for them over here.
For most folks, having the bolt handle bent out a tad and making sure the recoil lugs are sturdy plus a glass or steelbed treatment from stem to stern will provide one with a quite good and very servicable, dependable dangerous game rifle.