Re: Whoever Fights Monsters...
Examining the cartridge case, Schaeffer determined that other than the calibre (".388"), there were no other headstamps or maker's marks. A civilian headstamp would have calibre and maker's initials, a military round would have calibre, maker, year and NATO/SATO STANAG stamp (cross in a circle for NATO, X in a box for SATO). .338 had been marketed to civilians as a hunting round, and several SATO nations (Germany, the UK, the CSA) had issued it to some snipers along with rifles firing a 12.7x99mm match-grade round.
The lack of information on the headstamp indicated postwar manufacture. There was little wear and tear, unlike most brass which would be recovered for handloading and repeated reuse. If he had to guess the case was newly machined with a very high degree of precision and not hand-tooled. The powder was a high quality that had burned cleanly, leaving only the barest trace.