Don't think they were so different, the problem back then was our know all see all government decided to use power they had on hand and not the powder recommend for the 5.56. Fouled chambers and it puts you in a bad spot when your using a cleaning rod or a knife trying to clear stuck brass in a fight.
Smoke 'em while you've got them.Thanks for sharing the other deals. I still can't believe how low prices have gotten these days.