Thread: Identify this action and barrel?

I picked up an old target rifle for cheap, to use as a project, for no special reason.

It has a very heavy fluted barrel which I have no use for, but just trying to figure out what other barrel may fit. The thread is about 1.06-1.08" (1 & 1/16th??) or 27.2mm. This measurement should be more accurate but thats what you get with $5 calipers from aliexpress. Its got a 16TPI thread. Would I be right in saying that this is the same as Rem700?

I don't know what the rest of the action is based off, I assume its custom made by someone. The front half of the bolt is M98 style with front lugs and mauser extractor. Anyone seen something like this before?