I have a rifle built by Sterling, probably one of the last dozen or so that he built. Mine was built on a Steyr Mauser with a surface ground front ring but I can't tell what yours is from the photos. He built some guns on Model 70s as well. Mine used a Blackburn trigger and I believe that he used Douglas barrels. I wish I had more info: he was a skilled craftsman, a real gentleman and his prices were extremely reasonable.
Sterling was featured in a very comprehensive chapter of the Gun Digest Book of Riflesmithing and, since you own the rifle, will probably find the piece interesting:
https://www.amazon.com/Digest-Book-Riflesmithing-Jack-Mitchell/dp/091067647X
