gunwonk
Well-Known Member
The primer blow back some how pushed the case forward [ ... ]
No, the case got pushed forward (BEFORE things went "bang"), and then the primer blew back out of the case when it went off, because there was so much extra room back there.
[ ... ] and pulled it out of the extractor.
No, actually I think the front edge of the extractor pushed the case forward until the shoulder bottomed out on the front of the chamber, and the case was so short that the extractor didn't reach far enough to hook over the case rim. (That's how the Savage extractor works, isn't it? You push the bolt face onto a round, and the extractor snaps over the rim?)
I sent the pictures to Shooters World and the guy they said he bets that the amount the primer backed out is how much the shoulder was pushed back.
+1
I going back to sctrach on my next reloads of 308. I bought some factory ammo (first time ever buying 308) and want to see what the shoulder is after firing a couple to setup the die again.
Yes! Good move.
Suggest you use the calipers to measure base-to-shoulder on the factory round BEFORE firing it, and then measure again afterward. It should get maybe .004" - .006" longer. Then adjust your dies so the resized brass is a little shorter than the fired round -- we're talking .00x" here -- but no shorter than the unfired factory round. Double check that the resized brass chambers okay -- and extracts -- and you're on the road again.