Hmmm I think you mean the .276 Enfield and the P-13 rifle. Due to ammunition problems and unstable powder which resulted in a breech explosion and the shooter who was a member of the Selection commitee and he lost an eye. This was the ned really for the .276 the final nail in the coffin was of course the out break of WW1. The P-14 became the P-14 and eventually the US Rifle 1917.
Sir Charles Ross tried to get his .280 adopted but failed.
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