I remember that FN 50 tracer stuff being SO common in the mid-1970s that we would buy crates of the stuff for less than $8 (Oz) per hundred, pull the projectiles and reseat soft-points (Oz-made "Super") for hunting. The funny thing is that, at the time, I gave a swag of the projectiles to a couple of "eccentric " types who were reloading for 7.7 Jap............

The packets were a "beige-ish" cardboard, with a crimson label clearly stating "pour BREN". I think I still have one round and an empty packet with label somewhere.....

There was also a swag of FN ball ammo of similar vintage and suitable markings around at the same time: EXCELLENT ammo indeed. I still have a substantial quantity of the fired brass, (being a chronic scrounger) and it takes the "standard" RWS .217" 5608 or 6627 Berdan primer. Being non-Mercuric, it is good for quite a few reloads; (chambers permitting). Considerable quantities of these cases are slowly "returning to nature" across a vast swathe of southern Queensland.