Well this is the problem with ANY of the muskets in question, and the fallacy Americans have in misunderstanding what "proofing" actually does.
I have been reenacting with Black Powder muzzle loaders for more than three decades, and I have been shooting BP muzzle loaders for 45 years.
Now I've seen countless inspections of muskets at reenactments, both ACW rifled muskets and smoothbore muskets, all repros. Some were Italian and proofed, and some were Japanese or India origin, and not. They were ALL checked for cleanliness, proper half **** positions, flash protectors, and hammer stalls..., but none, NONE were ever bore scoped to look for neglect. Just because that musket is nice and clean on the outside, and rust free, doesn't mean that pitting hasn't resulted from lack of care or improper care inside the barrel, and the barrel has become compromised. The Italian barrels have no immunity from this.
Yet when I point this out, I can tell the diehard Pedersoli owners, as they become quite upset when I point out that operator error is the same risk since it has nothing to do with which musket the person is wielding, and Indian, Japanese, or Italian, IF the musket isn't Indian, it's as likely to be forty years old as it is likely to be new..., and not even proofing can shield the barrel from years of neglect. The assumption that many have of, "The musket is fine, it looks clean and it's a Pedersoli", is sophistry.
LD