I looked into this quite a bit because I was thinking about buying a 5.7 pistol. The problem is doing a bolt gun in one doesn't make much sense. The reason is the case isn't really viable to reload. You have such little brass around the primer. Ammo for 5.7 is pretty spendy and take away that option for the cartridge being suited to reloading and its not as cool as it may sound, all to have something that duplicates a 22 hornet more or less..
