It's 10 rounds on the rifle magazine and 19 named rifles. (Or copies or duplicates of them). Magazine ban is not restricted to centerfire either. Haven't been able to get the 25 (or 50) round magazines for my 10/22 (.22 caliber semi-auto rifle from Ruger) in years, and they tend to not last long.
For what it's worth - I'm looking at my 10 year old copy of the law now - the definition of an assault weapon with repect to a rifle merely requires a detachable magazine (assuming all other criterea are met) - no mention of magazine capacity is given with respect to the definition of the semi-auto rifle as an assault weapon.
While I'm glad this thing is going to expire, I must admit that, until it came along, I had allowed a youthful interest in firearms to fall into disuse. I probably never would have learned what I have with respect to firearms (or acquired my current "inventory") if this rancid law and the equally rancid Clinton had not been.
Like I said, the Law of Unintended Consequences...