Depends....
A Colt will almost always have a "half ring", as they generally lift the dog about halfway between the stops. Not always, though, I've seen some with better timing (and maybe they were worked on).
Rugers, at least all those I've seen, will get a 2/3 ring, as they lift even sooner than the Colts. Never seen one with no ring.
S&W.... most I've seen have less ring than the Colt..... about 1/3. Usually less pronounced than the Colt - my guess is that it's not as strong a spring on the dog.
And, with all of them, if you don't take a little care to index the cylinder as you close it, you'll eventually get a full ring.