Except in a tight .577, which had a .574" bore & used .562" balls, I have usually used .575" moulds for .58 calibre rifles. This included a Numrich U/H barrel as well as 2 Zouaves and a Bill
Large .58 cut rifled barrel. I never measured the balls from my .575" mould, however they weighed 285gr., so were quite close to .575".
One .570" mould I bought and still have, casts .574" balls. I used that one in a .58 Kodiak rifle with .008" rifling. I have mostly used .021" to .0235" denim and ticking patches with these .574"
& .575" balls.
If the rifling is deeper than .012", you might need thicker patching yet.