Then there are a few old hoarders like me who can generally shake one from the tree for a good cause.
There have been several guys that converted Mausers and Enfields to .45ACP, as it is friendly to the extractor. They fit a pistol mag in the front and put a block to keep it forward. No reason it couldn't be made to work for 7.62x25.
I saw somewhere that some Aussies had used a No4 Enfield for a .223 in which they removed the bolt head completely and fabricated an extractor and plunger ejector to fit on the shortened bolt. I believe all the had to do with the bolt after that was to shorten the firing pin. Then they threaded the barrel to screw in past the normal spot and mating it up with the shorter bolt. The then had an AR orMini-14 mag fitted in the new shorter chamber.