The Royal Enfield and Bullet names derive from the company's links with the Royal Small Arms Factory in Enfield, London.
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The Enfield name derives from the location of the Royal Small Arms Factory at Enfield Lock, the armoury where British Military Small Arms were produced (in this case, the Enfield revolver the cartridge was best known for being used in), while Eley was a British commercial brand.
Development on what is known as the .55 Boys was started by Captain H C Boys, a designer at the Royal Small Arms Factory, Enfield.
After being mobilized during the war he escaped German and Russian forces and made his way to England, where he was a part of the "Polish design team" at Enfield Lock's Royal Small Arms Factory.
The Remington Model 30 is a US sporting rifle of the inter-war period based on the military P14/M1917 Enfield rifle action, which was manufactured for the British and US governments during World War I.