Mike is right .RR were smaller,It does not take much effort to load a dry ball & push some form of wadding[paper,,tow,wasp nest ,ect.] on top of a ball,I saw a long barreled Buccaneer musket at fortress Duisburg that had only a 1/4" RR,& it fit the pipes.Patch & ball in smoothbore seems to be a more modern thing,same with greased wads on top of ball,A smaller rammer also helps to make a much slimmer forend/forestock ;)some thing i might do on my next fusil.
Alex............