Fiocchi should be good to use, I haven't had any experience with it though. If you think about it, what else can you use this ammo for? No one chambers anything for this caliber anymore except for the Rugers that were built several years ago and came with a spare barrel in 30 cal. I suspect those for the most part were never used. Benelli built a pistol in this caliber, they didn't sell many of them. FN built a HP in this caliber but there aren't that many of them over here as did Beretta, so if you think about it all of the intended market for the 30 luger is for those who own the Lugers that are chambered for it whether it is the many thousands of the original commercials or the 70's built Mausers.
I acquired my 1900 AE in 1974 when I was 14. I came with 4-5 hundred rounds of ammo from the 30-40-50's era. All were mixed boxes of Winchester, Western, Remington, Peters and were either FMJ or soft point. Mine really liked the sp type and I burned most of it up. I later found Norma brand at a Gibsons Discount Center on close out for $6.97 a box and picked up 6-7 boxes of that, it really liked that too.(Well, my dad got it for me)
So, I'll bet that any of the 30 cal you find will not be a problem. If you do happen to find some of the old stuff don't shoot it as it has become collectible in itsself.
SteveM