on a more serious note,
Any “semiautomatic, centerfire, or rimfire rifle that has a fixed magazine with the capacity to accept more than 10 rounds,” except for tubular-magazine .22s.
Above was quoted from an NRA source purporting to be quoting the actual language of the Senator Feinstein to-be-proposed bill. Other language prohibits manufacture and import of 11+ round magazines.
IMHO Way worse than a high capacity magazine ban is that "Gandfathered" weapons would all have to be registered, with a fee to be paid to Uncle Sam, and then turned over to Uncle Sam (Big Brother Sam) when the owner dies, according to the same NRA source.
She's asking for a lot. If she gets it, she'll ask for more.
Disclaimer: All the above language regarding the possible future bill is from an NRA source, and I did not do any independent research to verify it.