Here is the Mosin. As it turns out, the Mosin is really tight, but I can close it. But, the .22 fits well in this case that I am using for the Mosin, so I only need one case for the Mosin, then this case will free up for the .22.
Have you considered adding a "case window" for the bipod to project out of? This could also be helpful in storage or cased display situations. If the case is too short, perhaps a "barrel vent" for the barrel to project from?