I bought a .562" mould for the tight bore'd Enfield and have tried the mould with WW in a normal .580 bore'd rifle. They would perfectly, being some .018" undersize to it's bores.
Many guys here use WW in smoothbores, including myself, Taylor, Hatchet Jack, probably Leatherbelly and Crispy- 3 .62's, Taylor's .62 and .77, and Crispy shooting a 28 bore. I believe Clarence is using pure lead balls in his 24 bore smoothie, same ball he uses in his .54 rifle barrel - same gun.