This does NOT answer your question
Is this gun an original Springfield modification?

If so it is HISTORY.

What is the condition of the barrel now? Inside and outside.

Then if necessary, I would reline and keep the original barrel

http://summitarmsservices.com/

OR

See if you can locate an original 1922 barrel and modify it.

AND ON A SEPARATE NOTE
I would bet light weight .224 bullets would work just fine in a barrel that has been shot a bunch. Start out real low and work up.

https://www.midsouthshooterssupply.com/i...inter-100-count

Mike