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There's a good chance the surplus pulldown bullets are now undersized and they are being partially pulled back out as the ram is lowered (aka: insufficient case neck tension).
Also, if you are using surplus pulldown military brass without sizing, there's a good chance the necks are oversized.
To verify this, take one of the long cartridges and try pushing it bullet nose first against a solid wood surface. If the bullet moves in the case, then you have a case neck tension problem.
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