Believe at present that Zoli and Euro Arms both build the current crop of Zouave rifles. The originals, and for many years, they were turned out like the originals were in the 1860's, that is with three lands and three grooves only .003" deep which is what works best for the Minie type projectiles that were the typical military load for combat longarms of the day. The problem was that those shallow and extremely wide lands and grooves did a poor job of grabbing the patching on round balls. We, that is the guys in the sport in the early to mid 60's, found this very puzzling till it was determined what was going on. Equally unfortunate was the bad wrap that 1-48" inch twist got when the rate of twist wasn't the problem at all. An awful lot of MBBW has been written and said about that twist rate by many who didn't understand the actual problem. We found that using a thinner patch and lowering the velocity made substantial improvements in accuracy.
More recently, the makers have made changes in the rifling of Zouave rifles to improve the accuracy of PRB loads. For Euro Arms, it was to slow the twist to 1-66" and deepen the grooves to .005" depth. I don't know for sure what Zoli may have done but it's probably similar. To slow to 1-72" would more directly affect the stability of Minie or other conical projectiles. The slight slowing of twist rate and very slight increase of groove depth by Euro Arms probably won't seriously mess up the accuracy of longer bullets. Some one here may know what Zoli's current twist rate is, I just don't know at present.