The .416 Rigby is a rifle cartridge designed in 1911 by London based gunmaker John Rigby & Company, for hunting dangerous game. It is the first cartridge to use a bullet of .416 inch (10.57 mm) diameter.
Using a rimless design, with a steep 45-degree shoulder for good head spacing, Rigby found the optimum formula, with a 410-grain bullet propelled at 2390 fps, for just over 5,000 ft.-lbs. of energy, and it soon developed an excellent reputation for deep penetration on all big game animals, including elephant. The high sectional density values of the 410-grain bullet (0.338) and even the modern 400-grain bullet (0.330) guarantee that the solids will reach the brain of the biggest bull elephant and the soft points would give excellent penetration, destroying vital tissue and putting dangerous game down fast. 
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