.700 Nitro Express. Although .50 is technically the largest caliber you can legally own without an NFA destructive device permit (which California will never allow), there are exceptions for some cartridges determined to be for sporting purposes (such as the .600 Nitro Express, .577 Tyrannousaur, .700 Nitro Express, etc.). California also has a ban specifically on rifles which fire the .50 Browning Machine Gun (BMG) cartridge.
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