The Pattern 1913 Enfield (P13) was an experimental rifle developed by the Royal Small Arms Factory for the British Army as a result of its combat experience in the Second Boer War from 1899 to 1902. The weapon was to serve as a replacement for the Short Magazine Lee–Enfield (SMLE). An advanced chamber design allowed for a high-velocity .276 Enfield rimless round, which was more powerful than the service-issued .303 British cartridge. Introduction of the P13 was rendered impractical by the outbreak of the First World War.