Sounds like a great idea. Pistols are small enough to focus on small details and still not take forever, and they are fun for plinking, easy on powder, and simple to clean while still satisfying the urge to make smoke; if it it is the same caliber as your rifle, then you already have all the accessories, which is a big plus, also. They might not have been common, but I'm sure someone back then had one in his rifle's caliber for an emergency.