I think Eaker might have a slightly different opinion of "worst case".
Me too.
"I have seen evidence of Korean manufactured .30-06 M2 Ball being fired at both our ranges. The use of this ammunition is not authorized at our ranges. In the State of Texas alone, I have heard of 6 M1 and 1903 rifles that have been wrecked by this ammunition. The headstamps are TK, PS and KA. I would recommend dismantling this ammunition, discarding the brass and using it's components to reload in safe brass. The catastrophic case failure is called a "P" split. The case ruptures through the primer pocket on firing. I have mentioned this problem before but apparently somebody missed the message. There are other lots of military ammunition that are dangerous:
French .30 M2 Ball dated in the 1950's
British Kynoch .30 M2 Ball Headstamped K 60
These lots of ammunition are a potential BOMB. I am enclosing a photo of an M1 rifle wrecked by the Korean ammo and a photo of two Korean .30-06 Ctg cases that split at the primer pocket.
The French ammo has severely damaged a Remington Model 700 and Remington Model 760 in my County in Mississippi.
Some lots of Austrian .30 M2 Ball have soft rims and the use in a semi-auto rifle causes the rims to pull off causing the rifle to malfunction.
There are more and worse stories about problematical ammo- including US M80 ball- fired through 7,62 NATO Garands with unhappy results.