"Large ring" and "small ring" refer only to the diameter of the chamber end of the barrel. Mausers come in long, medium and short action lengths. Some may argue about the "medium" length, but I believe it.
Most stocks can be inletted from short action to long action, but check your measurements carefully BEFORE you start removing wood. It is not considered cool to put sawdust back in the stock to fill goofs.
I have seen a long action inletted stock used with a short action that looked pretty good. The excess space was filled with an engraved block and looked as it it had been planned that way. Whatever works.