I have quite a few Ramline stocks on my rifles. Results have been very satisfactory. Fill the hollow butt with an expanding foam and that gets rid of the "booming" so often associated with hollow stocks. In most cases they are a total drop in, at least that has been my experience. Butler creek makes a nice stock for the Mauser as well. I think they're made for military actions as I had to do some serious glass bedding and inletting to put a commercial Mauser action of mine into that stock.
Paul B.