Well I just looked the law up and after all the back and forth in here we seem to have forgotten about the OP's original question.
Is an S&W 617 considered an assault weapon and can you put 10 rounds in it.
Well looking at the law and the FAQ's the state has put out about it.
See here;
http://www.governor.ny.gov/2013/gun-reforms-faq
It specifically states that revolvers as a class are exempt from the law and even lists the 617 as NOT on the assault weapons list.
So it would appear that owning one and loading 10 rounds in it is OK.
One thing not addressed in the bill is magazines that fit two different types of guns like the banned tactical AR version of the 10/22.
The same magazine also fits the not banned standard 10/22 and the bolt action 77/22.
Gonna be fun to see how they twist themselves in knots trying to figure that one out.