@John J
The British in 1913 designed the P13 action for the new 276 cartridge to replace the SMLE and 303 cartridge. The rifle was sent to the USA to manufacture. It was found the new 276 cartridge burnt barrels out very quickly.
WW1 bike out and the British found they didn't have enough SMLE rifles and promptly got the USA to manufacture it in 303. This became the P14. In the meantime the British had caught up in the manufacturing of the SMLE and offered the USA money to stop producing the P14 and regard the contract filled.
When the USA entered the war they found they didn't have enough Springfield rifles to arm their troops so converted the P14 to fire the 30/06. All that need to be done was to replace the barrel, recoil the bolt for a rimless cartridge and modify the feed rails and mag follower. The m17 was born.
After the war the U.S. troops were that impressed with the M17 they wanted it as the service weapon but the powers that be stuck with the Springfield.
All up around 4 million P14 and M17's were made .
After the war with the left over parts Remington made the model 30 and 30s. These were the forerunner of the 720,721 and eventually the model 700.
I hope this gives you a brief history of your rifle.
Yes I am an Enfield lunatics well as a Whelen fanatic.
As a by note Holland and Holland thought that highly of the rifle they even made bespoke 375H &H rifles out of them
Bob