All Round balls are intended to be patched. Some are loaded " bare" in smoothbore muskets, only because the bore dimensions of the barrels could vary so widely, and there was no time to clean the bores on a battle field. The lead balls provided were purposely sized under size for the bore, so that they could still be shot as the bores began to get tight from powder residue. Some of the guns actually showed better accuracy after a number of shots had been fired to dirty the bore for the size ball being shot. This was, at best, an
Unintended consequence", and not something planned. Warfare at the time period use muskets as massed cannon fire, where point the gun was all that was desired, to lay a line of fire down that would mow down ranks of troops facing your own lines at as little as 50 yards distance. Aimed fire was not desireable or appreciated. The muskets had NO rear sights. Aimed fire could ( and did) prove to be particularly dangerous to Officers who rode horses behind their lines of troops and gave commands to field grade officers of lower ranks who were forward of their position.
"0" Buck is .32 caliber. No.1 buck is .30 caliber. If the .32 caliber buck proves too tight for your barrel, then try the #1 buck balls, and a thicker patch. They should work.