RE: What happend here?
 

"What happend here?"

Well, it looks to me like those cases were pushed too far up into the seating die, and the case mouths made contact with the die's crimping shoulder. The die "tried" to crimp the bullets, but there was no cannelure in the bullet shank to push the case mouth brass into, so instead, having to go someplace, it collapsed your case shoulders!

No problem-been there, done that!

In the future when you need to seat a bullet deeper, just screw in the seating stem, NOTTHE WHOLE DIE!! To set up the seating die, screw it in until it makes contact with themouth of any empty case, then back it out about 1/4 to 1/2 turn andlock it in that position so it can't ouch your cases. Then just use the seating stem to regulate the OAL of the loaded rounds.

Good luck!