From Argentina - the 45 (called '11.25'; 45 in metric) was phased out in military and police issue some decade back; it was a long process and so the headstamp could say anything between somewhere in the 'forties' (corrosive) and after the fifties to 'sixties (non corrosive)- until very recently, they would be 'Berdan' cases (hard to reload) against 'Boxer). They are in general ok, quite up in the 800 ft per sec...
I guess it depends more on if you plan to rescue the brass for reloading than anything else. For What Its Worth:
Peter Knight - from Cordoba - Argentina