Really round roll crimp?
Sounds like blank ammo that's been demilled. In .30-06 at least, the cases "selected" for loading as blanks was often REJECT brass. According to legend, there was a remote possiblity of case failure, depending on the underlying defect.
Now that you're scared (maybe), I should note that I've heard no stories of the same being true for .30 Carbine.
I strongly suggest annealing the case mouths before ruining any more cases. Either dip in molten lead for 2 seconds, or hold in your lefthand fingers while hitting the mouth with a propane torch. As soon as it's uncomfortably hot, drop it into a water bucket.
The old pan of water and heat 'em till it just starts to glow approach overdoes it.
A clue to whether they're Chinese--closely compare the headstamps' typeface/letter spacing with known USGI stuff. They usually don't get an exact match.
|