Portugal's headstamp was FNM. Some was remanufactured for the DCRA as match ammo by Brit' John Carmichael in the mid '90's..
SB is Spanish for Santa Barbara.
CBC is Brazil. Some was remanufactured from unsafe imported ammo by Gold Cross for sale to DCRA shooters. Some guys had problems (weak crimping etc), and sadly Gold Cross lost its otherwise stellar reputation.
The long and sad tale of CBC ammo includes rejected lots in one South American country sold to another, where the powder was somehow adulterated with pistol powder, and then rejected again. Those pallets of ammo wound up in the US, where they did indeed blow up guns and all of that ammo was supposed to be condemned. Once again, boys were boys and bad ammo came North, but Gold Cross got their hands on the bulk of it to be feedstock for their target ammo. I did find a case of unsafe ammo which has since been remanufactured into reloads for blasting.
FWIW, I had some Austrian Hirtenberger 148(?)gr factory ball and reloaded CBC cases with 168gr bullets. The Hirtenberger was disappointing; twice as big a group as the reloads with my good M700.