Re: Anyone Reload cases from linked 7.62?
The issue is stretched case base walls. Machine guns are headspaced long, to reduce jams and misfeeds, and are notoriously hard on their brass.
You can test for this (after f/l resizing) using the paperclip test.
Straighten out a paperclip for two curves, bend a right angle (about 1/16" long) in the end, and use the tip to scrape along up and down the inside of the case for about the bottom 3/4". If the tip catches in a groove running around the inside circumference, the case is looking at a case head separation fairly soon and should be recycled as scrap brass.
Greg