I would be interested to know if anyone uses a Zouave bullet in a .577" and if they have any accuracy.
When I first stared using BP I bought a S/H reproduction Zouave and a Zouave bullet mould. I never got any decent accuracy with it so I switched to the Lee .577" bullet. That performed better. I suspect it is because of the deep base cavity that allowed the bullet to expand into the rifling.

I have never spoken to anyone who thinks the Zouave bullet is any good. Everyone reckons that the skirt is too thick and prevents proper expansion into the rifling.

I still have the Zouave bullet mould so I might have a new, different style base plug made, and see how it performs.