Any rifle chambered for that cartridge. Most will be custom made double rifles.
a .700 nitro express
There's the .700 Nitro Express.
No, the .600 Nitro Express is more powerful. Also, there is a .700 Nitro Express round that is designed for a rifle, but there is one handgun that will fire it.
"Cheap" and "700 Nitro" should not be in the same sentence. Last one I saw sold, with case and accesories, was $69,000. Before that, $79,000.
700 Nitro, 600 Nitro, 505 Gibbs, 375 H&H Magnum, 460 Weatherby,
Possibly the .460 Weatherby Magnum, the .577 T-Rex, or the .700 Nitro Express.
.700 Nitro Express
.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.
If you are ordering what is typically a $75,000 custom rifle, you can pretty much get what you want. All 700 NEs are smokeless poweder (or cordite) rifles. It will depend on the bulllet, and the type of powder used.
The sustained rate of fire (on fully automatic) of the M14 battle rifle is 700-750 rounds per minute.
There are over 1500 different cartirdges that are/have been made. Calibers run the range from .17 Hornady to the .700 Nitro express.
The cyclic rate of fire of the M16 assault rifle is 700-950 rounds per minute.