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Sorry about the delay, and yes the write-up was a bit long and probably would have been better served with a contents listing:

1. Source quality brass in 8x57
2. Neck down to .308 ( .308Win...

Thanks Guys for the comments.
I PMed ebf on the head separation issue. There is information on this online; identification , causes, prevention, probably better to refer to what is already out...

Forming .257 Roberts Ackley Improved cases from 8x57 brass


Background


Recently I found that I was down to my last ten or so loaded rounds for the hunting rifle chambered in .257...