The trick is finding someone with a MAS49/56 to shoot it in.
Actually, most of us 49/56 owners will pass up the corrosive stuff because the gas system on these rifles is such a PITA to clean, particularly the cutoff valve. We do, however shoot the corrosive stuff in our Model 36s. They are much easier to clean.
Valuable? Not particularly, since Prvi started manufacturing the good stuff. You have to watch for the Syrian ammo, too. It is about as reliable as Paki 303 ammo.