I tried this with my 1858 Uberti carbine. The way I did it was, 30gr. Goex fffg, one of Gatofeo's felt wads, enough #8 shot to almost fill the chamber and covered that up with Crisco to keep the shot from falling out. At 25 feet I found one small hole where one shot had hit a 2ft X 2ft piece of cardboard.