RE: the Argentine stuff, there was some Argentine surplus .308 that made it’s way on the market quite some time back that was insanely mis-loaded. I read some anecdotal instance of it blowing apart some guys new M1A, the pressures were in the 120-140 thousand psi range.
I wonder if they had some really bad streak of QA/QC?
I don’t know what the problem actually was with that Argentine .45 ammo. My guess would be bad storage but it sure looked good. Bright and shiny.
I might mention that the most accurate 1911 I ever owned and by a good bit, was an Argentine made model 1927. I didn’t have a Ransom rest but wish I had as it seemed capable of nearly unbelievable accuracy.