Little-e: Pretty close. Back in the blackpowder days, some shooters used a smooth, undersized bullet, hand-wrapped in bond paper to bring it up to groove diameter. Supposed to be more accurate. Mostly in calibers 38-55 on up, although the old Lyman books show bullets as small as .25. They must have had more patience than me, as the 38s drive me nuts with my big fingers.
A pain to make up, but it's fun to rediscover lost arts. Beside, the loaded rounds look COOL! [g]