The only experience with Fiocchi primers I have is somewhat dated. About 12 years ago I picked up a 1000 LP primers and used them.
Well, most of them.
The fired well, produced decently accurate loads, but the cups were too hard or something. At any rate they cracked around the edges and left burn marks on the breach face of two of my revolvers.
When I found this I tossed the rest in the burn barrel.
Again, that is the only experience I have with them.
Joe