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470 nitro
Roosevelt safari elephant2

Roland's gun is a double rifle, chambered in .600 Nitro Express, the gun was made by Butch Searcy, a well regarded California gun builder who specializes in high end hunting rifles, mostly bolt actions and double rifles.

Due to its large size is used for hunting elephants, rhinos and other large animals. The gun was used in The Lost World: Jurassic Park.