Check for additional stampings under the bolyknob..
there should be three ap\lpha-characters something like [BSA, RFI, OR LB] and a date X-XX for month and last two digits of year.
BSA = Birmingham Small Arms, Rifle Factory, India
If you are REALLY LUCKY YOU, SAVAGE ARMS - US Property - Lend-Lease.
What you have in the pictures are likely when the rifle was return to an arsenal for rebuilding.
NOTE : If reloading, do not full-length resize case, as the British Army, cut the cased shoulder deeper by .0625", since the cartridge headspaces on the case rim, the British wanted any round that was picked-up from the filed would Chamber and fire for the user.
so you'll need to neack-size for maximum case-life.