The 1917 action is much stronger, and faster than the '03 Springfailed. The late Fred Wells built many .500 Wells custom rifles that sold for huge money, and never had any problems with any of them.
Fred turned down .50BMG barrels and rechambered them for his cartridge, and I can personally tell you they're brutally high pressure, and recoil, yet the old Enfield holds it great!
The only reason Fred ever started building his own receiver was he ran out of cheap used Enfield actions to customise.