If I remember(a problem) in the information on Dr. Drews site it gives a date when the ammo manufacturers assoc. decided to print the warnings on the box. 1937 comes to mind but i was amazed it was so late. My thought being that if it were a problem why did it take 30 years to come up with this. All recollections subject to correction with a guarantee of 30% accuracy. Check out his site ,it has a wealth of information.
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