I made several hundred in the good old days and used a bunch of DA 65 7.62 brass I had.
THAT WAS WORK!!!
The old DA brass was about as thick as a bank vault door and I had to ream the necks on all of them
I was lucky to get two loadings out of them before they split
The commercial Winchester and Remington brass was about 15 % lighter and made great cases that did not split....until they pulled the plug on us.