A sizing die should NEVER move brass like a dozer blade, if it does then its lacking a chamfer and should be replaced.
Its a sizing die which is required to gently size down the neck dia of brass, not remove metal to make the necks thinner.
Your neck tension will be uncontrolled and lessen every time the brass is forced into that die
Bin the die, otherwise all your brass will need a neck turn to uniform it and a tighter bushing in a bushing type sizing die to restore the neck tension value that you used in load development (2-8 thou)
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