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Collapsed shoulders
Newbie,
I'm afraid I had a similar experience when I first started. My problem was that I had the bullet seating die screwed in to far. So as I finished the seating stroke the crimping portion of the die engaged too soon. This crimped the bullet firmly to the brass and subsequently collapsed my shoulders. Try unscrewing the seating die two turns and seating with no crimp. I'm loading with no crimp on my AR and do not observe the bullets being seated deeper when loaded from the mag, nor unseating the bullets in the mag when firing. This is with hot supersonic 125 loads. Lighter loads and subsonic loads should be fine with no crimp as well. Give that a try and I suspect your collapsed shoulders will be a thing of the past.
Good luck,
8)
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