Numbers of Colt M1911s 455 Webley Automatic caliber/ and other M1911's

Colt Government Model 455 Webley SN:W19106 MFG:1915 - JJ - Old Colt

.455 Webley vs 45acp

The .455 Webley and .45 ACP cartridges are two of the most iconic handgun cartridges from the early 20th century. While they share a similar caliber, they differ significantly in their design and intended use. The .455 Webley is a rimmed cartridge designed for use in revolvers, while the .45 ACP is a rimless cartridge intended for use in automatic pistols. This fundamental difference in rim design makes reliable chambering problematic, as the .45 ACP lacks the necessary rim for proper headspace in revolvers. Additionally, the .45 ACP is a significantly higher-pressure cartridge than the .455 Webley, which was designed to operate at lower pressures. Attempting to fire a .45 ACP round in a .455 Webley revolver could overstress the firearm’s components, potentially leading to catastrophic failure and serious injury. Standard Deviation Display Bullets

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FN Grand Browning: The European 1911 that Never Happened – Forgotten ...

During World War II, the Office Of Strategic Service used M1911 pistols in .38 Super.[16][17][18] The Norwegian resistance used .38 Super M1911 pistols, purchased 1,429 examples in mid-1940 by the British Purchasing Commission. King Haakon VII of Norway used one of the .38 Super M1911s as his personal defence weapon in WW2.[citation needed]
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Colonel Thompson’s Tests

The Thompson-LeGarde tests of 1904, led by the inventor of the Tommy Gun, Colonel John T. Thompson, became a cornerstone in the search for the next service pistol. These tests rigorously evaluated various calibers, including the 7.65×21mm Parabellum and the 9×19mm Parabellum. Thompson’s conclusion was unequivocal: the new service pistol must be no less than .45 caliber.
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This led to the historic trials that pitted renowned firearms manufacturers against each other. The tests each firearm underwent were grueling, with one in particular seeing each individual firearm expel 6,000 rounds of ammunition over the course of two days. The Colt M1911, which would eventually be declared the winner, famously continued firing after being dunked in water because it became too hot. Its creator, John Moses Browning, was reportedly in attendance for this feat.
Colt 1911 Government Cal. 7,65 Parabellum - Semiautomatic Pistol - used

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