Got this stuff in a buy out a few years back no nothing about it other then I think there reloads and they look the same I have 116 casings and 77 live rounds
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Yeah you can neck up to 6ppc from 220 Russian which is most common. You can also use a die and form the shoulder/neck from 7.62x39 brass to make the ppc. If you look in the pictures you’ll see some stamped 220 Russian as well. I shoot a 6ppc and have seen this with the x39 brass before back when lapua was short on 220 Russian brass.The original case was 7.62x39. The cases you have, have been modified into a different caliber. This is a normal practice for bench rest shooters always seeking the smallest group possible. It appears they have been shortened and the shoulder angle has been changed. I would think the case necks have been resized to a smaller caliber than 7.62.