Is it a crude repair for a stripped out cartridge guide screw hole? What modifications are visible on the inside of the receiver?

I have a 1906 DOM 1894 rifle in 38-55. The worn bore slugged at 0.380". It shoots good with Vollmer 255 gr. JSP ordered in 0.380" diameter. For cast bullets, I use a Rimrock Bullets 245 gr. cast bullet sized at 0.382". Anything smaller keyholes badly.

Enjoy your new rifle.