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The longer neck of the .450/400 3ΒΌ inch case had been causing extraction difficulties in the Nitro Express version of that cartridge particularly in rifles which may have pitting or rusting.
He used two of these doubles, a .476 Westley Richards and a .500 Nitro Express, to take dangerous game in Africa on two different safaris.
A few manufacturers still make rifles chambered in 577 Nitro Express due to its popularity including Hartmann & Weiss, Heym, Holland and Holland, Butch Searcy & Co., James Purdey and Sons, Westley Richards, and Hambrusch Hunting Weapons.