Anything is possible, but frankly, expecting that it was shot through anything other than a nearly worn out belt-fed of one flavor or another, is pretty much like taste testing turds and expecting the next one will taste better. It might, but the odds...not good!
Unless you were there when the stuff hit the dirt, it all gets treated as if it was going to need the full treatment.
The FN has been gone a very long time. Lesse. I think we got our Famil on the new C7 about '85. That sound about right?
So to even really have a chance, you are looking for dates earlier than that. Except that there were a bunch more rounds being fed through the pigs than through the rifles.
When anyone had money for training use ammo...
